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Finding the Fourth Proportional to 100.39, 150.46 and 42.60

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Solution

The fourth proportional to 100.39, 150.46 and 42.60 is: 63.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.39 : 150.46 = 42.60 : x
  2. Step 2: Convert to fraction form
    100.39/150.46 = 42.60/x
  3. Step 3: Cross multiply
    100.39x = 150.46 × 42.60
  4. Step 4: Simplify right side
    100.39x = 6,409.60
  5. Step 5: Solve for x
    x = 6,409.60/100.39
  6. Step 6: Final answer
    x = 63.85

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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.