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Finding the Fourth Proportional to 398,581.70, 558,429.10 and 398,581.70

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Solution

The fourth proportional to 398,581.70, 558,429.10 and 398,581.70 is: 558,429.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,581.70 : 558,429.10 = 398,581.70 : x
  2. Step 2: Convert to fraction form
    398,581.70/558,429.10 = 398,581.70/x
  3. Step 3: Cross multiply
    398,581.70x = 558,429.10 × 398,581.70
  4. Step 4: Simplify right side
    398,581.70x = 222,579,620,007.47
  5. Step 5: Solve for x
    x = 222,579,620,007.47/398,581.70
  6. Step 6: Final answer
    x = 558,429.10

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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.