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Finding the Fourth Proportional to 91.77, 136.99 and 87.83

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Solution

The fourth proportional to 91.77, 136.99 and 87.83 is: 131.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.77 : 136.99 = 87.83 : x
  2. Step 2: Convert to fraction form
    91.77/136.99 = 87.83/x
  3. Step 3: Cross multiply
    91.77x = 136.99 × 87.83
  4. Step 4: Simplify right side
    91.77x = 12,031.83
  5. Step 5: Solve for x
    x = 12,031.83/91.77
  6. Step 6: Final answer
    x = 131.11

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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.