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Finding the Fourth Proportional to 278,886.40, 418,329.60 and 259,640.80

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Solution

The fourth proportional to 278,886.40, 418,329.60 and 259,640.80 is: 389,461.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,886.40 : 418,329.60 = 259,640.80 : x
  2. Step 2: Convert to fraction form
    278,886.40/418,329.60 = 259,640.80/x
  3. Step 3: Cross multiply
    278,886.40x = 418,329.60 × 259,640.80
  4. Step 4: Simplify right side
    278,886.40x = 108,615,432,007.68
  5. Step 5: Solve for x
    x = 108,615,432,007.68/278,886.40
  6. Step 6: Final answer
    x = 389,461.20

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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.