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Finding the Fourth Proportional to 102.97, 142.66 and 100.47

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Solution

The fourth proportional to 102.97, 142.66 and 100.47 is: 139.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.97 : 142.66 = 100.47 : x
  2. Step 2: Convert to fraction form
    102.97/142.66 = 100.47/x
  3. Step 3: Cross multiply
    102.97x = 142.66 × 100.47
  4. Step 4: Simplify right side
    102.97x = 14,333.05
  5. Step 5: Solve for x
    x = 14,333.05/102.97
  6. Step 6: Final answer
    x = 139.20

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.