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Finding the Fourth Proportional to 90.59, 125.08 and 72.16

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Solution

The fourth proportional to 90.59, 125.08 and 72.16 is: 99.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.59 : 125.08 = 72.16 : x
  2. Step 2: Convert to fraction form
    90.59/125.08 = 72.16/x
  3. Step 3: Cross multiply
    90.59x = 125.08 × 72.16
  4. Step 4: Simplify right side
    90.59x = 9,025.28
  5. Step 5: Solve for x
    x = 9,025.28/90.59
  6. Step 6: Final answer
    x = 99.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.