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Finding the Fourth Proportional to 158,686.59, 218,987.49 and 90,705.03

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Solution

The fourth proportional to 158,686.59, 218,987.49 and 90,705.03 is: 125,172.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,686.59 : 218,987.49 = 90,705.03 : x
  2. Step 2: Convert to fraction form
    158,686.59/218,987.49 = 90,705.03/x
  3. Step 3: Cross multiply
    158,686.59x = 218,987.49 × 90,705.03
  4. Step 4: Simplify right side
    158,686.59x = 19,863,266,850.07
  5. Step 5: Solve for x
    x = 19,863,266,850.07/158,686.59
  6. Step 6: Final answer
    x = 125,172.94

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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.