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Finding the Fourth Proportional to 398,434.32, 550,377.84 and 318,422.64

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Solution

The fourth proportional to 398,434.32, 550,377.84 and 318,422.64 is: 439,853.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,434.32 : 550,377.84 = 318,422.64 : x
  2. Step 2: Convert to fraction form
    398,434.32/550,377.84 = 318,422.64/x
  3. Step 3: Cross multiply
    398,434.32x = 550,377.84 × 318,422.64
  4. Step 4: Simplify right side
    398,434.32x = 175,252,764,810.30
  5. Step 5: Solve for x
    x = 175,252,764,810.30/398,434.32
  6. Step 6: Final answer
    x = 439,853.59

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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.