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Finding the Fourth Proportional to 667,688.49, 921,449.05 and 377,292.66

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Solution

The fourth proportional to 667,688.49, 921,449.05 and 377,292.66 is: 520,685.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,688.49 : 921,449.05 = 377,292.66 : x
  2. Step 2: Convert to fraction form
    667,688.49/921,449.05 = 377,292.66/x
  3. Step 3: Cross multiply
    667,688.49x = 921,449.05 × 377,292.66
  4. Step 4: Simplify right side
    667,688.49x = 347,655,963,128.97
  5. Step 5: Solve for x
    x = 347,655,963,128.97/667,688.49
  6. Step 6: Final answer
    x = 520,685.87

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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.