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Finding the Fourth Proportional to 398,435.45, 550,379.39 and 318,423.77

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Solution

The fourth proportional to 398,435.45, 550,379.39 and 318,423.77 is: 439,855.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,435.45 : 550,379.39 = 318,423.77 : x
  2. Step 2: Convert to fraction form
    398,435.45/550,379.39 = 318,423.77/x
  3. Step 3: Cross multiply
    398,435.45x = 550,379.39 × 318,423.77
  4. Step 4: Simplify right side
    398,435.45x = 175,253,878,338.26
  5. Step 5: Solve for x
    x = 175,253,878,338.26/398,435.45
  6. Step 6: Final answer
    x = 439,855.14

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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.