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Finding the Fourth Proportional to 677,878.40, 935,555.15 and 391,398

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Solution

The fourth proportional to 677,878.40, 935,555.15 and 391,398 is: 540,177.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    677,878.40 : 935,555.15 = 391,398 : x
  2. Step 2: Convert to fraction form
    677,878.40/935,555.15 = 391,398/x
  3. Step 3: Cross multiply
    677,878.40x = 935,555.15 × 391,398
  4. Step 4: Simplify right side
    677,878.40x = 366,174,414,599.70
  5. Step 5: Solve for x
    x = 366,174,414,599.70/677,878.40
  6. Step 6: Final answer
    x = 540,177.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.