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Finding the Fourth Proportional to 15,213.02, 20,987.90 and 9,905.90

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Solution

The fourth proportional to 15,213.02, 20,987.90 and 9,905.90 is: 13,666.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,213.02 : 20,987.90 = 9,905.90 : x
  2. Step 2: Convert to fraction form
    15,213.02/20,987.90 = 9,905.90/x
  3. Step 3: Cross multiply
    15,213.02x = 20,987.90 × 9,905.90
  4. Step 4: Simplify right side
    15,213.02x = 207,904,038.61
  5. Step 5: Solve for x
    x = 207,904,038.61/15,213.02
  6. Step 6: Final answer
    x = 13,666.19

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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.