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Finding the Fourth Proportional to 42.62, 63.70 and 30.60

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Solution

The fourth proportional to 42.62, 63.70 and 30.60 is: 45.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.62 : 63.70 = 30.60 : x
  2. Step 2: Convert to fraction form
    42.62/63.70 = 30.60/x
  3. Step 3: Cross multiply
    42.62x = 63.70 × 30.60
  4. Step 4: Simplify right side
    42.62x = 1,949.14
  5. Step 5: Solve for x
    x = 1,949.14/42.62
  6. Step 6: Final answer
    x = 45.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.