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Finding the Fourth Proportional to 51.47, 71.12 and 42.83

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Solution

The fourth proportional to 51.47, 71.12 and 42.83 is: 59.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.47 : 71.12 = 42.83 : x
  2. Step 2: Convert to fraction form
    51.47/71.12 = 42.83/x
  3. Step 3: Cross multiply
    51.47x = 71.12 × 42.83
  4. Step 4: Simplify right side
    51.47x = 3,046.07
  5. Step 5: Solve for x
    x = 3,046.07/51.47
  6. Step 6: Final answer
    x = 59.18

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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.