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Finding the Fourth Proportional to 42.57, 63.90 and 30.57

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Solution

The fourth proportional to 42.57, 63.90 and 30.57 is: 45.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.57 : 63.90 = 30.57 : x
  2. Step 2: Convert to fraction form
    42.57/63.90 = 30.57/x
  3. Step 3: Cross multiply
    42.57x = 63.90 × 30.57
  4. Step 4: Simplify right side
    42.57x = 1,953.42
  5. Step 5: Solve for x
    x = 1,953.42/42.57
  6. Step 6: Final answer
    x = 45.89

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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.