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Finding the Fourth Proportional to 278,689.20, 418,033.80 and 260,026.80

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Solution

The fourth proportional to 278,689.20, 418,033.80 and 260,026.80 is: 390,040.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,689.20 : 418,033.80 = 260,026.80 : x
  2. Step 2: Convert to fraction form
    278,689.20/418,033.80 = 260,026.80/x
  3. Step 3: Cross multiply
    278,689.20x = 418,033.80 × 260,026.80
  4. Step 4: Simplify right side
    278,689.20x = 108,699,991,305.84
  5. Step 5: Solve for x
    x = 108,699,991,305.84/278,689.20
  6. Step 6: Final answer
    x = 390,040.20

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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.