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Finding the Fourth Proportional to 100.46, 150.95 and 76.70

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Solution

The fourth proportional to 100.46, 150.95 and 76.70 is: 115.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.46 : 150.95 = 76.70 : x
  2. Step 2: Convert to fraction form
    100.46/150.95 = 76.70/x
  3. Step 3: Cross multiply
    100.46x = 150.95 × 76.70
  4. Step 4: Simplify right side
    100.46x = 11,577.30
  5. Step 5: Solve for x
    x = 11,577.30/100.46
  6. Step 6: Final answer
    x = 115.25

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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.