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Finding the Fourth Proportional to 408,321.88, 612,482.82 and 127,861

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Solution

The fourth proportional to 408,321.88, 612,482.82 and 127,861 is: 191,791.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,321.88 : 612,482.82 = 127,861 : x
  2. Step 2: Convert to fraction form
    408,321.88/612,482.82 = 127,861/x
  3. Step 3: Cross multiply
    408,321.88x = 612,482.82 × 127,861
  4. Step 4: Simplify right side
    408,321.88x = 78,312,665,848.02
  5. Step 5: Solve for x
    x = 78,312,665,848.02/408,321.88
  6. Step 6: Final answer
    x = 191,791.50

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.