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Finding the Fourth Proportional to 102.24, 142.07 and 100.89

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Solution

The fourth proportional to 102.24, 142.07 and 100.89 is: 140.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.24 : 142.07 = 100.89 : x
  2. Step 2: Convert to fraction form
    102.24/142.07 = 100.89/x
  3. Step 3: Cross multiply
    102.24x = 142.07 × 100.89
  4. Step 4: Simplify right side
    102.24x = 14,332.94
  5. Step 5: Solve for x
    x = 14,332.94/102.24
  6. Step 6: Final answer
    x = 140.19

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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.