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Finding the Fourth Proportional to 667,854.40, 921,637 and 361,939.56

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Solution

The fourth proportional to 667,854.40, 921,637 and 361,939.56 is: 499,475.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,854.40 : 921,637 = 361,939.56 : x
  2. Step 2: Convert to fraction form
    667,854.40/921,637 = 361,939.56/x
  3. Step 3: Cross multiply
    667,854.40x = 921,637 × 361,939.56
  4. Step 4: Simplify right side
    667,854.40x = 333,576,890,259.72
  5. Step 5: Solve for x
    x = 333,576,890,259.72/667,854.40
  6. Step 6: Final answer
    x = 499,475.47

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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.