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Finding the Fourth Proportional to 158,390.73, 218,567.79 and 86,759.19

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Solution

The fourth proportional to 158,390.73, 218,567.79 and 86,759.19 is: 119,721.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,390.73 : 218,567.79 = 86,759.19 : x
  2. Step 2: Convert to fraction form
    158,390.73/218,567.79 = 86,759.19/x
  3. Step 3: Cross multiply
    158,390.73x = 218,567.79 × 86,759.19
  4. Step 4: Simplify right side
    158,390.73x = 18,962,764,420.49
  5. Step 5: Solve for x
    x = 18,962,764,420.49/158,390.73
  6. Step 6: Final answer
    x = 119,721.43

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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.