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Finding the Fourth Proportional to 158,686.35, 218,987.15 and 90,704.78

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Solution

The fourth proportional to 158,686.35, 218,987.15 and 90,704.78 is: 125,172.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,686.35 : 218,987.15 = 90,704.78 : x
  2. Step 2: Convert to fraction form
    158,686.35/218,987.15 = 90,704.78/x
  3. Step 3: Cross multiply
    158,686.35x = 218,987.15 × 90,704.78
  4. Step 4: Simplify right side
    158,686.35x = 19,863,179,715.12
  5. Step 5: Solve for x
    x = 19,863,179,715.12/158,686.35
  6. Step 6: Final answer
    x = 125,172.58

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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.