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Finding the Fourth Proportional to 278,703.20, 418,054.80 and 260,040.80

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Solution

The fourth proportional to 278,703.20, 418,054.80 and 260,040.80 is: 390,061.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,703.20 : 418,054.80 = 260,040.80 : x
  2. Step 2: Convert to fraction form
    278,703.20/418,054.80 = 260,040.80/x
  3. Step 3: Cross multiply
    278,703.20x = 418,054.80 × 260,040.80
  4. Step 4: Simplify right side
    278,703.20x = 108,711,304,635.84
  5. Step 5: Solve for x
    x = 108,711,304,635.84/278,703.20
  6. Step 6: Final answer
    x = 390,061.20

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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.