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Finding the Fourth Proportional to 659,020.20, 987,218.10 and 378,209.40

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Solution

The fourth proportional to 659,020.20, 987,218.10 and 378,209.40 is: 566,561.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,020.20 : 987,218.10 = 378,209.40 : x
  2. Step 2: Convert to fraction form
    659,020.20/987,218.10 = 378,209.40/x
  3. Step 3: Cross multiply
    659,020.20x = 987,218.10 × 378,209.40
  4. Step 4: Simplify right side
    659,020.20x = 373,375,165,270.14
  5. Step 5: Solve for x
    x = 373,375,165,270.14/659,020.20
  6. Step 6: Final answer
    x = 566,561.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.