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Finding the Fourth Proportional to 91.08, 136.32 and 50.40

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Solution

The fourth proportional to 91.08, 136.32 and 50.40 is: 75.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.08 : 136.32 = 50.40 : x
  2. Step 2: Convert to fraction form
    91.08/136.32 = 50.40/x
  3. Step 3: Cross multiply
    91.08x = 136.32 × 50.40
  4. Step 4: Simplify right side
    91.08x = 6,870.53
  5. Step 5: Solve for x
    x = 6,870.53/91.08
  6. Step 6: Final answer
    x = 75.43

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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.