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Finding the Fourth Proportional to 278,884.40, 418,326.60 and 259,638.80

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Solution

The fourth proportional to 278,884.40, 418,326.60 and 259,638.80 is: 389,458.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,884.40 : 418,326.60 = 259,638.80 : x
  2. Step 2: Convert to fraction form
    278,884.40/418,326.60 = 259,638.80/x
  3. Step 3: Cross multiply
    278,884.40x = 418,326.60 × 259,638.80
  4. Step 4: Simplify right side
    278,884.40x = 108,613,816,432.08
  5. Step 5: Solve for x
    x = 108,613,816,432.08/278,884.40
  6. Step 6: Final answer
    x = 389,458.20

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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.