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Finding the Fourth Proportional to 667,686.49, 921,446.29 and 377,290.66

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Solution

The fourth proportional to 667,686.49, 921,446.29 and 377,290.66 is: 520,683.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,686.49 : 921,446.29 = 377,290.66 : x
  2. Step 2: Convert to fraction form
    667,686.49/921,446.29 = 377,290.66/x
  3. Step 3: Cross multiply
    667,686.49x = 921,446.29 × 377,290.66
  4. Step 4: Simplify right side
    667,686.49x = 347,653,078,908.65
  5. Step 5: Solve for x
    x = 347,653,078,908.65/667,686.49
  6. Step 6: Final answer
    x = 520,683.11

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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.