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Finding the Fourth Proportional to 15,353.88, 21,189.12 and 8,641.68

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Solution

The fourth proportional to 15,353.88, 21,189.12 and 8,641.68 is: 11,925.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,353.88 : 21,189.12 = 8,641.68 : x
  2. Step 2: Convert to fraction form
    15,353.88/21,189.12 = 8,641.68/x
  3. Step 3: Cross multiply
    15,353.88x = 21,189.12 × 8,641.68
  4. Step 4: Simplify right side
    15,353.88x = 183,109,594.52
  5. Step 5: Solve for x
    x = 183,109,594.52/15,353.88
  6. Step 6: Final answer
    x = 11,925.95

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Half scale
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Double scale
Find fourth proportional to 15,354.88, 21,190.50 and 8,642.68
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.