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Finding the Fourth Proportional to 129.02, 193.40 and 90.55

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Solution

The fourth proportional to 129.02, 193.40 and 90.55 is: 135.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.02 : 193.40 = 90.55 : x
  2. Step 2: Convert to fraction form
    129.02/193.40 = 90.55/x
  3. Step 3: Cross multiply
    129.02x = 193.40 × 90.55
  4. Step 4: Simplify right side
    129.02x = 17,510.95
  5. Step 5: Solve for x
    x = 17,510.95/129.02
  6. Step 6: Final answer
    x = 135.72

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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.