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Finding the Fourth Proportional to 100.31, 150.35 and 42.58

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Solution

The fourth proportional to 100.31, 150.35 and 42.58 is: 63.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.31 : 150.35 = 42.58 : x
  2. Step 2: Convert to fraction form
    100.31/150.35 = 42.58/x
  3. Step 3: Cross multiply
    100.31x = 150.35 × 42.58
  4. Step 4: Simplify right side
    100.31x = 6,401.12
  5. Step 5: Solve for x
    x = 6,401.12/100.31
  6. Step 6: Final answer
    x = 63.82

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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.