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Finding the Fourth Proportional to 91.23, 136.72 and 45.48

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Solution

The fourth proportional to 91.23, 136.72 and 45.48 is: 68.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.23 : 136.72 = 45.48 : x
  2. Step 2: Convert to fraction form
    91.23/136.72 = 45.48/x
  3. Step 3: Cross multiply
    91.23x = 136.72 × 45.48
  4. Step 4: Simplify right side
    91.23x = 6,218.03
  5. Step 5: Solve for x
    x = 6,218.03/91.23
  6. Step 6: Final answer
    x = 68.16

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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.