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Finding the Fourth Proportional to 158,687.85, 218,989.20 and 90,706.29

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Solution

The fourth proportional to 158,687.85, 218,989.20 and 90,706.29 is: 125,174.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,687.85 : 218,989.20 = 90,706.29 : x
  2. Step 2: Convert to fraction form
    158,687.85/218,989.20 = 90,706.29/x
  3. Step 3: Cross multiply
    158,687.85x = 218,989.20 × 90,706.29
  4. Step 4: Simplify right side
    158,687.85x = 19,863,697,882.07
  5. Step 5: Solve for x
    x = 19,863,697,882.07/158,687.85
  6. Step 6: Final answer
    x = 125,174.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.