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Finding the Fourth Proportional to 328,207.20, 492,310.80 and 278,999.70

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Solution

The fourth proportional to 328,207.20, 492,310.80 and 278,999.70 is: 418,499.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,207.20 : 492,310.80 = 278,999.70 : x
  2. Step 2: Convert to fraction form
    328,207.20/492,310.80 = 278,999.70/x
  3. Step 3: Cross multiply
    328,207.20x = 492,310.80 × 278,999.70
  4. Step 4: Simplify right side
    328,207.20x = 137,354,565,506.76
  5. Step 5: Solve for x
    x = 137,354,565,506.76/328,207.20
  6. Step 6: Final answer
    x = 418,499.55

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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.