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Finding the Fourth Proportional to 90.39, 124.80 and 67.08

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Solution

The fourth proportional to 90.39, 124.80 and 67.08 is: 92.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.39 : 124.80 = 67.08 : x
  2. Step 2: Convert to fraction form
    90.39/124.80 = 67.08/x
  3. Step 3: Cross multiply
    90.39x = 124.80 × 67.08
  4. Step 4: Simplify right side
    90.39x = 8,371.58
  5. Step 5: Solve for x
    x = 8,371.58/90.39
  6. Step 6: Final answer
    x = 92.62

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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.