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Finding the Fourth Proportional to 102.39, 153.80 and 63.92

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Solution

The fourth proportional to 102.39, 153.80 and 63.92 is: 96.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.39 : 153.80 = 63.92 : x
  2. Step 2: Convert to fraction form
    102.39/153.80 = 63.92/x
  3. Step 3: Cross multiply
    102.39x = 153.80 × 63.92
  4. Step 4: Simplify right side
    102.39x = 9,829.81
  5. Step 5: Solve for x
    x = 9,829.81/102.39
  6. Step 6: Final answer
    x = 96.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.