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Finding the Fourth Proportional to 76.43, 114.51 and 42.18

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Solution

The fourth proportional to 76.43, 114.51 and 42.18 is: 63.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.43 : 114.51 = 42.18 : x
  2. Step 2: Convert to fraction form
    76.43/114.51 = 42.18/x
  3. Step 3: Cross multiply
    76.43x = 114.51 × 42.18
  4. Step 4: Simplify right side
    76.43x = 4,830.03
  5. Step 5: Solve for x
    x = 4,830.03/76.43
  6. Step 6: Final answer
    x = 63.20

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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.