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Finding the Fourth Proportional to 71.25, 98.40 and 49.17

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Solution

The fourth proportional to 71.25, 98.40 and 49.17 is: 67.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.25 : 98.40 = 49.17 : x
  2. Step 2: Convert to fraction form
    71.25/98.40 = 49.17/x
  3. Step 3: Cross multiply
    71.25x = 98.40 × 49.17
  4. Step 4: Simplify right side
    71.25x = 4,838.60
  5. Step 5: Solve for x
    x = 4,838.60/71.25
  6. Step 6: Final answer
    x = 67.91

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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.