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Finding the Fourth Proportional to 278,891.10, 391,497.30 and 278,891.10

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Solution

The fourth proportional to 278,891.10, 391,497.30 and 278,891.10 is: 391,497.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,891.10 : 391,497.30 = 278,891.10 : x
  2. Step 2: Convert to fraction form
    278,891.10/391,497.30 = 278,891.10/x
  3. Step 3: Cross multiply
    278,891.10x = 391,497.30 × 278,891.10
  4. Step 4: Simplify right side
    278,891.10x = 109,185,112,644.03
  5. Step 5: Solve for x
    x = 109,185,112,644.03/278,891.10
  6. Step 6: Final answer
    x = 391,497.30

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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.