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Finding the Fourth Proportional to 689,627.72, 951,671.48 and 399,251.49

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Solution

The fourth proportional to 689,627.72, 951,671.48 and 399,251.49 is: 550,958.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,627.72 : 951,671.48 = 399,251.49 : x
  2. Step 2: Convert to fraction form
    689,627.72/951,671.48 = 399,251.49/x
  3. Step 3: Cross multiply
    689,627.72x = 951,671.48 × 399,251.49
  4. Step 4: Simplify right side
    689,627.72x = 379,956,254,384.25
  5. Step 5: Solve for x
    x = 379,956,254,384.25/689,627.72
  6. Step 6: Final answer
    x = 550,958.50

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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.