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Finding the Fourth Proportional to 398,503.20, 558,319.20 and 398,503.20

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Solution

The fourth proportional to 398,503.20, 558,319.20 and 398,503.20 is: 558,319.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,503.20 : 558,319.20 = 398,503.20 : x
  2. Step 2: Convert to fraction form
    398,503.20/558,319.20 = 398,503.20/x
  3. Step 3: Cross multiply
    398,503.20x = 558,319.20 × 398,503.20
  4. Step 4: Simplify right side
    398,503.20x = 222,491,987,821.44
  5. Step 5: Solve for x
    x = 222,491,987,821.44/398,503.20
  6. Step 6: Final answer
    x = 558,319.20

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1.5x scale

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.