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Finding the Fourth Proportional to 398,435.32, 550,379.22 and 318,423.64

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Solution

The fourth proportional to 398,435.32, 550,379.22 and 318,423.64 is: 439,854.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,435.32 : 550,379.22 = 318,423.64 : x
  2. Step 2: Convert to fraction form
    398,435.32/550,379.22 = 318,423.64/x
  3. Step 3: Cross multiply
    398,435.32x = 550,379.22 × 318,423.64
  4. Step 4: Simplify right side
    398,435.32x = 175,253,754,612.76
  5. Step 5: Solve for x
    x = 175,253,754,612.76/398,435.32
  6. Step 6: Final answer
    x = 439,854.97

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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.