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Finding the Fourth Proportional to 85.57, 118.07 and 48.71

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Solution

The fourth proportional to 85.57, 118.07 and 48.71 is: 67.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.57 : 118.07 = 48.71 : x
  2. Step 2: Convert to fraction form
    85.57/118.07 = 48.71/x
  3. Step 3: Cross multiply
    85.57x = 118.07 × 48.71
  4. Step 4: Simplify right side
    85.57x = 5,751.24
  5. Step 5: Solve for x
    x = 5,751.24/85.57
  6. Step 6: Final answer
    x = 67.21

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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.