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Finding the Fourth Proportional to 90.17, 124.36 and 55.20

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Solution

The fourth proportional to 90.17, 124.36 and 55.20 is: 76.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.17 : 124.36 = 55.20 : x
  2. Step 2: Convert to fraction form
    90.17/124.36 = 55.20/x
  3. Step 3: Cross multiply
    90.17x = 124.36 × 55.20
  4. Step 4: Simplify right side
    90.17x = 6,864.67
  5. Step 5: Solve for x
    x = 6,864.67/90.17
  6. Step 6: Final answer
    x = 76.13

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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.