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Finding the Fourth Proportional to 47.61, 71.36 and 28.39

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Solution

The fourth proportional to 47.61, 71.36 and 28.39 is: 42.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.61 : 71.36 = 28.39 : x
  2. Step 2: Convert to fraction form
    47.61/71.36 = 28.39/x
  3. Step 3: Cross multiply
    47.61x = 71.36 × 28.39
  4. Step 4: Simplify right side
    47.61x = 2,025.91
  5. Step 5: Solve for x
    x = 2,025.91/47.61
  6. Step 6: Final answer
    x = 42.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.