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Finding the Fourth Proportional to 663,218.41, 915,214.49 and 405,529.42

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Solution

The fourth proportional to 663,218.41, 915,214.49 and 405,529.42 is: 559,614.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,218.41 : 915,214.49 = 405,529.42 : x
  2. Step 2: Convert to fraction form
    663,218.41/915,214.49 = 405,529.42/x
  3. Step 3: Cross multiply
    663,218.41x = 915,214.49 × 405,529.42
  4. Step 4: Simplify right side
    663,218.41x = 371,146,399,277.65
  5. Step 5: Solve for x
    x = 371,146,399,277.65/663,218.41
  6. Step 6: Final answer
    x = 559,614.14

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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.