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Finding the Fourth Proportional to 158,687.59, 218,988.87 and 90,706.03

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Solution

The fourth proportional to 158,687.59, 218,988.87 and 90,706.03 is: 125,174.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,687.59 : 218,988.87 = 90,706.03 : x
  2. Step 2: Convert to fraction form
    158,687.59/218,988.87 = 90,706.03/x
  3. Step 3: Cross multiply
    158,687.59x = 218,988.87 × 90,706.03
  4. Step 4: Simplify right side
    158,687.59x = 19,863,611,011.89
  5. Step 5: Solve for x
    x = 19,863,611,011.89/158,687.59
  6. Step 6: Final answer
    x = 125,174.32

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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.