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Finding the Fourth Proportional to 124.67, 187.72 and 90.65

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Solution

The fourth proportional to 124.67, 187.72 and 90.65 is: 136.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.67 : 187.72 = 90.65 : x
  2. Step 2: Convert to fraction form
    124.67/187.72 = 90.65/x
  3. Step 3: Cross multiply
    124.67x = 187.72 × 90.65
  4. Step 4: Simplify right side
    124.67x = 17,017.06
  5. Step 5: Solve for x
    x = 17,017.06/124.67
  6. Step 6: Final answer
    x = 136.49

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.