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Finding the Fourth Proportional to 389,920.40, 584,443.20 and 221,521.40

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Solution

The fourth proportional to 389,920.40, 584,443.20 and 221,521.40 is: 332,033.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,920.40 : 584,443.20 = 221,521.40 : x
  2. Step 2: Convert to fraction form
    389,920.40/584,443.20 = 221,521.40/x
  3. Step 3: Cross multiply
    389,920.40x = 584,443.20 × 221,521.40
  4. Step 4: Simplify right side
    389,920.40x = 129,466,675,884.48
  5. Step 5: Solve for x
    x = 129,466,675,884.48/389,920.40
  6. Step 6: Final answer
    x = 332,033.60

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1.5x scale

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.