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Finding the Fourth Proportional to 48.86, 72.71 and 47.92

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Solution

The fourth proportional to 48.86, 72.71 and 47.92 is: 71.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.86 : 72.71 = 47.92 : x
  2. Step 2: Convert to fraction form
    48.86/72.71 = 47.92/x
  3. Step 3: Cross multiply
    48.86x = 72.71 × 47.92
  4. Step 4: Simplify right side
    48.86x = 3,484.26
  5. Step 5: Solve for x
    x = 3,484.26/48.86
  6. Step 6: Final answer
    x = 71.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.