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Finding the Fourth Proportional to 90.66, 136.16 and 72.74

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Solution

The fourth proportional to 90.66, 136.16 and 72.74 is: 109.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.66 : 136.16 = 72.74 : x
  2. Step 2: Convert to fraction form
    90.66/136.16 = 72.74/x
  3. Step 3: Cross multiply
    90.66x = 136.16 × 72.74
  4. Step 4: Simplify right side
    90.66x = 9,904.28
  5. Step 5: Solve for x
    x = 9,904.28/90.66
  6. Step 6: Final answer
    x = 109.25

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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.