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Finding the Fourth Proportional to 398,579.70, 558,426.30 and 398,579.70

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Solution

The fourth proportional to 398,579.70, 558,426.30 and 398,579.70 is: 558,426.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,579.70 : 558,426.30 = 398,579.70 : x
  2. Step 2: Convert to fraction form
    398,579.70/558,426.30 = 398,579.70/x
  3. Step 3: Cross multiply
    398,579.70x = 558,426.30 × 398,579.70
  4. Step 4: Simplify right side
    398,579.70x = 222,577,387,126.11
  5. Step 5: Solve for x
    x = 222,577,387,126.11/398,579.70
  6. Step 6: Final answer
    x = 558,426.30

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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.