Home / 389,945.80-585,113.10-221,595.40

Finding the Fourth Proportional to 389,945.80, 585,113.10 and 221,595.40

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Solution

The fourth proportional to 389,945.80, 585,113.10 and 221,595.40 is: 332,503.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,945.80 : 585,113.10 = 221,595.40 : x
  2. Step 2: Convert to fraction form
    389,945.80/585,113.10 = 221,595.40/x
  3. Step 3: Cross multiply
    389,945.80x = 585,113.10 × 221,595.40
  4. Step 4: Simplify right side
    389,945.80x = 129,658,371,439.74
  5. Step 5: Solve for x
    x = 129,658,371,439.74/389,945.80
  6. Step 6: Final answer
    x = 332,503.57

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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.