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Finding the Fourth Proportional to 129.40, 193.88 and 102.16

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Solution

The fourth proportional to 129.40, 193.88 and 102.16 is: 153.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.40 : 193.88 = 102.16 : x
  2. Step 2: Convert to fraction form
    129.40/193.88 = 102.16/x
  3. Step 3: Cross multiply
    129.40x = 193.88 × 102.16
  4. Step 4: Simplify right side
    129.40x = 19,806.78
  5. Step 5: Solve for x
    x = 19,806.78/129.40
  6. Step 6: Final answer
    x = 153.07

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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.