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Finding the Fourth Proportional to 91.90, 137.76 and 55.30

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Solution

The fourth proportional to 91.90, 137.76 and 55.30 is: 82.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.90 : 137.76 = 55.30 : x
  2. Step 2: Convert to fraction form
    91.90/137.76 = 55.30/x
  3. Step 3: Cross multiply
    91.90x = 137.76 × 55.30
  4. Step 4: Simplify right side
    91.90x = 7,618.13
  5. Step 5: Solve for x
    x = 7,618.13/91.90
  6. Step 6: Final answer
    x = 82.90

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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.