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Finding the Fourth Proportional to 91.55, 137.33 and 65.80

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Solution

The fourth proportional to 91.55, 137.33 and 65.80 is: 98.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.55 : 137.33 = 65.80 : x
  2. Step 2: Convert to fraction form
    91.55/137.33 = 65.80/x
  3. Step 3: Cross multiply
    91.55x = 137.33 × 65.80
  4. Step 4: Simplify right side
    91.55x = 9,036.31
  5. Step 5: Solve for x
    x = 9,036.31/91.55
  6. Step 6: Final answer
    x = 98.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.