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Finding the Fourth Proportional to 667,871.28, 921,700.08 and 396,100.08

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Solution

The fourth proportional to 667,871.28, 921,700.08 and 396,100.08 is: 546,640.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,871.28 : 921,700.08 = 396,100.08 : x
  2. Step 2: Convert to fraction form
    667,871.28/921,700.08 = 396,100.08/x
  3. Step 3: Cross multiply
    667,871.28x = 921,700.08 × 396,100.08
  4. Step 4: Simplify right side
    667,871.28x = 365,085,475,424.01
  5. Step 5: Solve for x
    x = 365,085,475,424.01/667,871.28
  6. Step 6: Final answer
    x = 546,640.48

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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.