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Finding the Fourth Proportional to 42.65, 63.90 and 30.63

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Solution

The fourth proportional to 42.65, 63.90 and 30.63 is: 45.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.65 : 63.90 = 30.63 : x
  2. Step 2: Convert to fraction form
    42.65/63.90 = 30.63/x
  3. Step 3: Cross multiply
    42.65x = 63.90 × 30.63
  4. Step 4: Simplify right side
    42.65x = 1,957.26
  5. Step 5: Solve for x
    x = 1,957.26/42.65
  6. Step 6: Final answer
    x = 45.90

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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.