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Finding the Fourth Proportional to 124.69, 186.98 and 66.90

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Solution

The fourth proportional to 124.69, 186.98 and 66.90 is: 100.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.69 : 186.98 = 66.90 : x
  2. Step 2: Convert to fraction form
    124.69/186.98 = 66.90/x
  3. Step 3: Cross multiply
    124.69x = 186.98 × 66.90
  4. Step 4: Simplify right side
    124.69x = 12,508.96
  5. Step 5: Solve for x
    x = 12,508.96/124.69
  6. Step 6: Final answer
    x = 100.32

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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.