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Finding the Fourth Proportional to 278,801.20, 391,109 and 278,801.20

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Solution

The fourth proportional to 278,801.20, 391,109 and 278,801.20 is: 391,109

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,801.20 : 391,109 = 278,801.20 : x
  2. Step 2: Convert to fraction form
    278,801.20/391,109 = 278,801.20/x
  3. Step 3: Cross multiply
    278,801.20x = 391,109 × 278,801.20
  4. Step 4: Simplify right side
    278,801.20x = 109,041,658,530.80
  5. Step 5: Solve for x
    x = 109,041,658,530.80/278,801.20
  6. Step 6: Final answer
    x = 391,109

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.