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Finding the Fourth Proportional to 398,545.20, 558,378 and 398,545.20

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Solution

The fourth proportional to 398,545.20, 558,378 and 398,545.20 is: 558,378

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,545.20 : 558,378 = 398,545.20 : x
  2. Step 2: Convert to fraction form
    398,545.20/558,378 = 398,545.20/x
  3. Step 3: Cross multiply
    398,545.20x = 558,378 × 398,545.20
  4. Step 4: Simplify right side
    398,545.20x = 222,538,871,685.60
  5. Step 5: Solve for x
    x = 222,538,871,685.60/398,545.20
  6. Step 6: Final answer
    x = 558,378

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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.