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Finding the Fourth Proportional to 51.52, 71.08 and 40

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Solution

The fourth proportional to 51.52, 71.08 and 40 is: 55.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.52 : 71.08 = 40 : x
  2. Step 2: Convert to fraction form
    51.52/71.08 = 40/x
  3. Step 3: Cross multiply
    51.52x = 71.08 × 40
  4. Step 4: Simplify right side
    51.52x = 2,843.20
  5. Step 5: Solve for x
    x = 2,843.20/51.52
  6. Step 6: Final answer
    x = 55.19

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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.