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Finding the Fourth Proportional to 677,879.40, 935,556.53 and 391,399

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Solution

The fourth proportional to 677,879.40, 935,556.53 and 391,399 is: 540,178.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    677,879.40 : 935,556.53 = 391,399 : x
  2. Step 2: Convert to fraction form
    677,879.40/935,556.53 = 391,399/x
  3. Step 3: Cross multiply
    677,879.40x = 935,556.53 × 391,399
  4. Step 4: Simplify right side
    677,879.40x = 366,175,890,285.47
  5. Step 5: Solve for x
    x = 366,175,890,285.47/677,879.40
  6. Step 6: Final answer
    x = 540,178.52

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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.