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Finding the Fourth Proportional to 124.92, 187.40 and 90.64

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Solution

The fourth proportional to 124.92, 187.40 and 90.64 is: 135.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.92 : 187.40 = 90.64 : x
  2. Step 2: Convert to fraction form
    124.92/187.40 = 90.64/x
  3. Step 3: Cross multiply
    124.92x = 187.40 × 90.64
  4. Step 4: Simplify right side
    124.92x = 16,985.94
  5. Step 5: Solve for x
    x = 16,985.94/124.92
  6. Step 6: Final answer
    x = 135.97

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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.