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Finding the Fourth Proportional to 71.60, 98.75 and 49.79

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Solution

The fourth proportional to 71.60, 98.75 and 49.79 is: 68.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.60 : 98.75 = 49.79 : x
  2. Step 2: Convert to fraction form
    71.60/98.75 = 49.79/x
  3. Step 3: Cross multiply
    71.60x = 98.75 × 49.79
  4. Step 4: Simplify right side
    71.60x = 4,917.13
  5. Step 5: Solve for x
    x = 4,917.13/71.60
  6. Step 6: Final answer
    x = 68.68

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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.