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Finding the Fourth Proportional to 398,017.20, 548,842.80 and 307,387.92

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Solution

The fourth proportional to 398,017.20, 548,842.80 and 307,387.92 is: 423,870.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,017.20 : 548,842.80 = 307,387.92 : x
  2. Step 2: Convert to fraction form
    398,017.20/548,842.80 = 307,387.92/x
  3. Step 3: Cross multiply
    398,017.20x = 548,842.80 × 307,387.92
  4. Step 4: Simplify right side
    398,017.20x = 168,707,646,698.98
  5. Step 5: Solve for x
    x = 168,707,646,698.98/398,017.20
  6. Step 6: Final answer
    x = 423,870.24

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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.