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Finding the Fourth Proportional to 11,445.18, 15,781.88 and 9,939.80

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Solution

The fourth proportional to 11,445.18, 15,781.88 and 9,939.80 is: 13,706.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,445.18 : 15,781.88 = 9,939.80 : x
  2. Step 2: Convert to fraction form
    11,445.18/15,781.88 = 9,939.80/x
  3. Step 3: Cross multiply
    11,445.18x = 15,781.88 × 9,939.80
  4. Step 4: Simplify right side
    11,445.18x = 156,868,730.82
  5. Step 5: Solve for x
    x = 156,868,730.82/11,445.18
  6. Step 6: Final answer
    x = 13,706.10

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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.