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Finding the Fourth Proportional to 667,770.50, 921,540.20 and 409,789.91

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Solution

The fourth proportional to 667,770.50, 921,540.20 and 409,789.91 is: 565,520.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,770.50 : 921,540.20 = 409,789.91 : x
  2. Step 2: Convert to fraction form
    667,770.50/921,540.20 = 409,789.91/x
  3. Step 3: Cross multiply
    667,770.50x = 921,540.20 × 409,789.91
  4. Step 4: Simplify right side
    667,770.50x = 377,637,868,962.73
  5. Step 5: Solve for x
    x = 377,637,868,962.73/667,770.50
  6. Step 6: Final answer
    x = 565,520.45

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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.