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Finding the Fourth Proportional to 100.47, 150.49 and 61.86

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Solution

The fourth proportional to 100.47, 150.49 and 61.86 is: 92.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.47 : 150.49 = 61.86 : x
  2. Step 2: Convert to fraction form
    100.47/150.49 = 61.86/x
  3. Step 3: Cross multiply
    100.47x = 150.49 × 61.86
  4. Step 4: Simplify right side
    100.47x = 9,309.31
  5. Step 5: Solve for x
    x = 9,309.31/100.47
  6. Step 6: Final answer
    x = 92.66

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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.