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Finding the Fourth Proportional to 85.43, 117.91 and 52.70

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Solution

The fourth proportional to 85.43, 117.91 and 52.70 is: 72.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.43 : 117.91 = 52.70 : x
  2. Step 2: Convert to fraction form
    85.43/117.91 = 52.70/x
  3. Step 3: Cross multiply
    85.43x = 117.91 × 52.70
  4. Step 4: Simplify right side
    85.43x = 6,213.70
  5. Step 5: Solve for x
    x = 6,213.70/85.43
  6. Step 6: Final answer
    x = 72.73

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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.