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Finding the Fourth Proportional to 689,645.39, 951,695.70 and 399,269.20

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Solution

The fourth proportional to 689,645.39, 951,695.70 and 399,269.20 is: 550,982.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,645.39 : 951,695.70 = 399,269.20 : x
  2. Step 2: Convert to fraction form
    689,645.39/951,695.70 = 399,269.20/x
  3. Step 3: Cross multiply
    689,645.39x = 951,695.70 × 399,269.20
  4. Step 4: Simplify right side
    689,645.39x = 379,982,780,782.44
  5. Step 5: Solve for x
    x = 379,982,780,782.44/689,645.39
  6. Step 6: Final answer
    x = 550,982.85

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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.