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Finding the Fourth Proportional to 124.65, 186.80 and 90.49

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Solution

The fourth proportional to 124.65, 186.80 and 90.49 is: 135.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.65 : 186.80 = 90.49 : x
  2. Step 2: Convert to fraction form
    124.65/186.80 = 90.49/x
  3. Step 3: Cross multiply
    124.65x = 186.80 × 90.49
  4. Step 4: Simplify right side
    124.65x = 16,903.53
  5. Step 5: Solve for x
    x = 16,903.53/124.65
  6. Step 6: Final answer
    x = 135.61

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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.