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Finding the Fourth Proportional to 398,988, 550,614.96 and 220,151.52

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Solution

The fourth proportional to 398,988, 550,614.96 and 220,151.52 is: 303,815.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,988 : 550,614.96 = 220,151.52 : x
  2. Step 2: Convert to fraction form
    398,988/550,614.96 = 220,151.52/x
  3. Step 3: Cross multiply
    398,988x = 550,614.96 × 220,151.52
  4. Step 4: Simplify right side
    398,988x = 121,218,720,378.74
  5. Step 5: Solve for x
    x = 121,218,720,378.74/398,988
  6. Step 6: Final answer
    x = 303,815.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.