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Finding the Fourth Proportional to 60.69, 83.78 and 38.87

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Solution

The fourth proportional to 60.69, 83.78 and 38.87 is: 53.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.69 : 83.78 = 38.87 : x
  2. Step 2: Convert to fraction form
    60.69/83.78 = 38.87/x
  3. Step 3: Cross multiply
    60.69x = 83.78 × 38.87
  4. Step 4: Simplify right side
    60.69x = 3,256.53
  5. Step 5: Solve for x
    x = 3,256.53/60.69
  6. Step 6: Final answer
    x = 53.66

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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.