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Finding the Fourth Proportional to 158,340.84, 218,500.32 and 86,721.72

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Solution

The fourth proportional to 158,340.84, 218,500.32 and 86,721.72 is: 119,670.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,340.84 : 218,500.32 = 86,721.72 : x
  2. Step 2: Convert to fraction form
    158,340.84/218,500.32 = 86,721.72/x
  3. Step 3: Cross multiply
    158,340.84x = 218,500.32 × 86,721.72
  4. Step 4: Simplify right side
    158,340.84x = 18,948,723,570.95
  5. Step 5: Solve for x
    x = 18,948,723,570.95/158,340.84
  6. Step 6: Final answer
    x = 119,670.48

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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.