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Finding the Fourth Proportional to 91.30, 124.34 and 90.76

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Solution

The fourth proportional to 91.30, 124.34 and 90.76 is: 123.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.30 : 124.34 = 90.76 : x
  2. Step 2: Convert to fraction form
    91.30/124.34 = 90.76/x
  3. Step 3: Cross multiply
    91.30x = 124.34 × 90.76
  4. Step 4: Simplify right side
    91.30x = 11,285.10
  5. Step 5: Solve for x
    x = 11,285.10/91.30
  6. Step 6: Final answer
    x = 123.60

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.