Home / 15,420.28-21,279.97-8,346.69

Finding the Fourth Proportional to 15,420.28, 21,279.97 and 8,346.69

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Solution

The fourth proportional to 15,420.28, 21,279.97 and 8,346.69 is: 11,518.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.28 : 21,279.97 = 8,346.69 : x
  2. Step 2: Convert to fraction form
    15,420.28/21,279.97 = 8,346.69/x
  3. Step 3: Cross multiply
    15,420.28x = 21,279.97 × 8,346.69
  4. Step 4: Simplify right side
    15,420.28x = 177,617,312.80
  5. Step 5: Solve for x
    x = 177,617,312.80/15,420.28
  6. Step 6: Final answer
    x = 11,518.42

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Half scale
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Double scale
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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.