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Finding the Fourth Proportional to 100.70, 150.94 and 39.80

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Solution

The fourth proportional to 100.70, 150.94 and 39.80 is: 59.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.70 : 150.94 = 39.80 : x
  2. Step 2: Convert to fraction form
    100.70/150.94 = 39.80/x
  3. Step 3: Cross multiply
    100.70x = 150.94 × 39.80
  4. Step 4: Simplify right side
    100.70x = 6,007.21
  5. Step 5: Solve for x
    x = 6,007.21/100.70
  6. Step 6: Final answer
    x = 59.66

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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.