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Finding the Fourth Proportional to 578,689.20, 868,594.05 and 279,379.80

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Solution

The fourth proportional to 578,689.20, 868,594.05 and 279,379.80 is: 419,340.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,689.20 : 868,594.05 = 279,379.80 : x
  2. Step 2: Convert to fraction form
    578,689.20/868,594.05 = 279,379.80/x
  3. Step 3: Cross multiply
    578,689.20x = 868,594.05 × 279,379.80
  4. Step 4: Simplify right side
    578,689.20x = 242,667,631,970.19
  5. Step 5: Solve for x
    x = 242,667,631,970.19/578,689.20
  6. Step 6: Final answer
    x = 419,340.18

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Double scale
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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.