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Finding the Fourth Proportional to 158,394.69, 218,589.71 and 86,779.08

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Solution

The fourth proportional to 158,394.69, 218,589.71 and 86,779.08 is: 119,757.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,394.69 : 218,589.71 = 86,779.08 : x
  2. Step 2: Convert to fraction form
    158,394.69/218,589.71 = 86,779.08/x
  3. Step 3: Cross multiply
    158,394.69x = 218,589.71 × 86,779.08
  4. Step 4: Simplify right side
    158,394.69x = 18,969,013,497.37
  5. Step 5: Solve for x
    x = 18,969,013,497.37/158,394.69
  6. Step 6: Final answer
    x = 119,757.89

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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.