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Finding the Fourth Proportional to 391,998.60, 587,123.10 and 302,963.40

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Solution

The fourth proportional to 391,998.60, 587,123.10 and 302,963.40 is: 453,768.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,998.60 : 587,123.10 = 302,963.40 : x
  2. Step 2: Convert to fraction form
    391,998.60/587,123.10 = 302,963.40/x
  3. Step 3: Cross multiply
    391,998.60x = 587,123.10 × 302,963.40
  4. Step 4: Simplify right side
    391,998.60x = 177,876,810,594.54
  5. Step 5: Solve for x
    x = 177,876,810,594.54/391,998.60
  6. Step 6: Final answer
    x = 453,768.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.