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Finding the Fourth Proportional to 48.79, 72.89 and 47.71

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Solution

The fourth proportional to 48.79, 72.89 and 47.71 is: 71.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.79 : 72.89 = 47.71 : x
  2. Step 2: Convert to fraction form
    48.79/72.89 = 47.71/x
  3. Step 3: Cross multiply
    48.79x = 72.89 × 47.71
  4. Step 4: Simplify right side
    48.79x = 3,477.58
  5. Step 5: Solve for x
    x = 3,477.58/48.79
  6. Step 6: Final answer
    x = 71.28

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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.