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Finding the Fourth Proportional to 72.71, 100.40 and 49.43

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Solution

The fourth proportional to 72.71, 100.40 and 49.43 is: 68.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.71 : 100.40 = 49.43 : x
  2. Step 2: Convert to fraction form
    72.71/100.40 = 49.43/x
  3. Step 3: Cross multiply
    72.71x = 100.40 × 49.43
  4. Step 4: Simplify right side
    72.71x = 4,962.77
  5. Step 5: Solve for x
    x = 4,962.77/72.71
  6. Step 6: Final answer
    x = 68.25

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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.