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Finding the Fourth Proportional to 663,218.16, 915,214.14 and 405,529.17

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Solution

The fourth proportional to 663,218.16, 915,214.14 and 405,529.17 is: 559,613.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,218.16 : 915,214.14 = 405,529.17 : x
  2. Step 2: Convert to fraction form
    663,218.16/915,214.14 = 405,529.17/x
  3. Step 3: Cross multiply
    663,218.16x = 915,214.14 × 405,529.17
  4. Step 4: Simplify right side
    663,218.16x = 371,146,030,566.46
  5. Step 5: Solve for x
    x = 371,146,030,566.46/663,218.16
  6. Step 6: Final answer
    x = 559,613.79

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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.