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Finding the Fourth Proportional to 90.17, 125.07 and 86.53

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Solution

The fourth proportional to 90.17, 125.07 and 86.53 is: 120.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.17 : 125.07 = 86.53 : x
  2. Step 2: Convert to fraction form
    90.17/125.07 = 86.53/x
  3. Step 3: Cross multiply
    90.17x = 125.07 × 86.53
  4. Step 4: Simplify right side
    90.17x = 10,821.80
  5. Step 5: Solve for x
    x = 10,821.80/90.17
  6. Step 6: Final answer
    x = 120.01

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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.