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Finding the Fourth Proportional to 52.68, 79.38 and 47.28

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Solution

The fourth proportional to 52.68, 79.38 and 47.28 is: 71.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.68 : 79.38 = 47.28 : x
  2. Step 2: Convert to fraction form
    52.68/79.38 = 47.28/x
  3. Step 3: Cross multiply
    52.68x = 79.38 × 47.28
  4. Step 4: Simplify right side
    52.68x = 3,753.09
  5. Step 5: Solve for x
    x = 3,753.09/52.68
  6. Step 6: Final answer
    x = 71.24

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.