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Finding the Fourth Proportional to 91.62, 126.40 and 52.80

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Solution

The fourth proportional to 91.62, 126.40 and 52.80 is: 72.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.62 : 126.40 = 52.80 : x
  2. Step 2: Convert to fraction form
    91.62/126.40 = 52.80/x
  3. Step 3: Cross multiply
    91.62x = 126.40 × 52.80
  4. Step 4: Simplify right side
    91.62x = 6,673.92
  5. Step 5: Solve for x
    x = 6,673.92/91.62
  6. Step 6: Final answer
    x = 72.84

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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.