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Finding the Fourth Proportional to 91.80, 136.62 and 91.80

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Solution

The fourth proportional to 91.80, 136.62 and 91.80 is: 136.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.80 : 136.62 = 91.80 : x
  2. Step 2: Convert to fraction form
    91.80/136.62 = 91.80/x
  3. Step 3: Cross multiply
    91.80x = 136.62 × 91.80
  4. Step 4: Simplify right side
    91.80x = 12,541.72
  5. Step 5: Solve for x
    x = 12,541.72/91.80
  6. Step 6: Final answer
    x = 136.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.