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Finding the Fourth Proportional to 158,390.35, 218,578.03 and 86,774.83

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Solution

The fourth proportional to 158,390.35, 218,578.03 and 86,774.83 is: 119,748.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,390.35 : 218,578.03 = 86,774.83 : x
  2. Step 2: Convert to fraction form
    158,390.35/218,578.03 = 86,774.83/x
  3. Step 3: Cross multiply
    158,390.35x = 218,578.03 × 86,774.83
  4. Step 4: Simplify right side
    158,390.35x = 18,967,071,394.98
  5. Step 5: Solve for x
    x = 18,967,071,394.98/158,390.35
  6. Step 6: Final answer
    x = 119,748.91

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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.