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Finding the Fourth Proportional to 439,867.20, 659,800.80 and 389,128.80

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Solution

The fourth proportional to 439,867.20, 659,800.80 and 389,128.80 is: 583,693.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,867.20 : 659,800.80 = 389,128.80 : x
  2. Step 2: Convert to fraction form
    439,867.20/659,800.80 = 389,128.80/x
  3. Step 3: Cross multiply
    439,867.20x = 659,800.80 × 389,128.80
  4. Step 4: Simplify right side
    439,867.20x = 256,747,493,543.04
  5. Step 5: Solve for x
    x = 256,747,493,543.04/439,867.20
  6. Step 6: Final answer
    x = 583,693.20

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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.