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Finding the Fourth Proportional to 52.71, 72.69 and 39.63

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Solution

The fourth proportional to 52.71, 72.69 and 39.63 is: 54.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.71 : 72.69 = 39.63 : x
  2. Step 2: Convert to fraction form
    52.71/72.69 = 39.63/x
  3. Step 3: Cross multiply
    52.71x = 72.69 × 39.63
  4. Step 4: Simplify right side
    52.71x = 2,880.70
  5. Step 5: Solve for x
    x = 2,880.70/52.71
  6. Step 6: Final answer
    x = 54.65

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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.