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Finding the Fourth Proportional to 718,794.90, 991,924.65 and 396,535.86

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Solution

The fourth proportional to 718,794.90, 991,924.65 and 396,535.86 is: 547,212.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,794.90 : 991,924.65 = 396,535.86 : x
  2. Step 2: Convert to fraction form
    718,794.90/991,924.65 = 396,535.86/x
  3. Step 3: Cross multiply
    718,794.90x = 991,924.65 × 396,535.86
  4. Step 4: Simplify right side
    718,794.90x = 393,333,694,142.95
  5. Step 5: Solve for x
    x = 393,333,694,142.95/718,794.90
  6. Step 6: Final answer
    x = 547,212.69

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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.