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Finding the Fourth Proportional to 15,339.12, 21,167.88 and 8,715.12

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Solution

The fourth proportional to 15,339.12, 21,167.88 and 8,715.12 is: 12,026.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,339.12 : 21,167.88 = 8,715.12 : x
  2. Step 2: Convert to fraction form
    15,339.12/21,167.88 = 8,715.12/x
  3. Step 3: Cross multiply
    15,339.12x = 21,167.88 × 8,715.12
  4. Step 4: Simplify right side
    15,339.12x = 184,480,614.35
  5. Step 5: Solve for x
    x = 184,480,614.35/15,339.12
  6. Step 6: Final answer
    x = 12,026.81

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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.