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Finding the Fourth Proportional to 51.42, 71.02 and 43.28

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Solution

The fourth proportional to 51.42, 71.02 and 43.28 is: 59.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.42 : 71.02 = 43.28 : x
  2. Step 2: Convert to fraction form
    51.42/71.02 = 43.28/x
  3. Step 3: Cross multiply
    51.42x = 71.02 × 43.28
  4. Step 4: Simplify right side
    51.42x = 3,073.75
  5. Step 5: Solve for x
    x = 3,073.75/51.42
  6. Step 6: Final answer
    x = 59.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.