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Finding the Fourth Proportional to 28,190.38, 38,904 and 15,615.13

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Solution

The fourth proportional to 28,190.38, 38,904 and 15,615.13 is: 21,549.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,190.38 : 38,904 = 15,615.13 : x
  2. Step 2: Convert to fraction form
    28,190.38/38,904 = 15,615.13/x
  3. Step 3: Cross multiply
    28,190.38x = 38,904 × 15,615.13
  4. Step 4: Simplify right side
    28,190.38x = 607,491,017.52
  5. Step 5: Solve for x
    x = 607,491,017.52/28,190.38
  6. Step 6: Final answer
    x = 21,549.59

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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.