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Finding the Fourth Proportional to 439,864.40, 659,213.40 and 389,709.20

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Solution

The fourth proportional to 439,864.40, 659,213.40 and 389,709.20 is: 584,047.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,864.40 : 659,213.40 = 389,709.20 : x
  2. Step 2: Convert to fraction form
    439,864.40/659,213.40 = 389,709.20/x
  3. Step 3: Cross multiply
    439,864.40x = 659,213.40 × 389,709.20
  4. Step 4: Simplify right side
    439,864.40x = 256,901,526,743.28
  5. Step 5: Solve for x
    x = 256,901,526,743.28/439,864.40
  6. Step 6: Final answer
    x = 584,047.10

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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.