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Finding the Fourth Proportional to 389,854.80, 584,976.60 and 221,504.40

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Solution

The fourth proportional to 389,854.80, 584,976.60 and 221,504.40 is: 332,367.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,854.80 : 584,976.60 = 221,504.40 : x
  2. Step 2: Convert to fraction form
    389,854.80/584,976.60 = 221,504.40/x
  3. Step 3: Cross multiply
    389,854.80x = 584,976.60 × 221,504.40
  4. Step 4: Simplify right side
    389,854.80x = 129,574,890,797.04
  5. Step 5: Solve for x
    x = 129,574,890,797.04/389,854.80
  6. Step 6: Final answer
    x = 332,367.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.