Home / 91,186.90-136,665.15-81,279.70

Finding the Fourth Proportional to 91,186.90, 136,665.15 and 81,279.70

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Solution

The fourth proportional to 91,186.90, 136,665.15 and 81,279.70 is: 121,816.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,186.90 : 136,665.15 = 81,279.70 : x
  2. Step 2: Convert to fraction form
    91,186.90/136,665.15 = 81,279.70/x
  3. Step 3: Cross multiply
    91,186.90x = 136,665.15 × 81,279.70
  4. Step 4: Simplify right side
    91,186.90x = 11,108,102,392.46
  5. Step 5: Solve for x
    x = 11,108,102,392.46/91,186.90
  6. Step 6: Final answer
    x = 121,816.87

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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.