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Finding the Fourth Proportional to 687,165.78, 948,333.63 and 396,789.60

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Solution

The fourth proportional to 687,165.78, 948,333.63 and 396,789.60 is: 547,595.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,165.78 : 948,333.63 = 396,789.60 : x
  2. Step 2: Convert to fraction form
    687,165.78/948,333.63 = 396,789.60/x
  3. Step 3: Cross multiply
    687,165.78x = 948,333.63 × 396,789.60
  4. Step 4: Simplify right side
    687,165.78x = 376,288,921,714.25
  5. Step 5: Solve for x
    x = 376,288,921,714.25/687,165.78
  6. Step 6: Final answer
    x = 547,595.55

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Double scale
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1.5x scale

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.