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Finding the Fourth Proportional to 398,543.20, 558,375.20 and 398,543.20

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Solution

The fourth proportional to 398,543.20, 558,375.20 and 398,543.20 is: 558,375.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,543.20 : 558,375.20 = 398,543.20 : x
  2. Step 2: Convert to fraction form
    398,543.20/558,375.20 = 398,543.20/x
  3. Step 3: Cross multiply
    398,543.20x = 558,375.20 × 398,543.20
  4. Step 4: Simplify right side
    398,543.20x = 222,536,639,008.64
  5. Step 5: Solve for x
    x = 222,536,639,008.64/398,543.20
  6. Step 6: Final answer
    x = 558,375.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.