Home / 389,780.40-584,233.20-221,381.40

Finding the Fourth Proportional to 389,780.40, 584,233.20 and 221,381.40

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Solution

The fourth proportional to 389,780.40, 584,233.20 and 221,381.40 is: 331,823.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,780.40 : 584,233.20 = 221,381.40 : x
  2. Step 2: Convert to fraction form
    389,780.40/584,233.20 = 221,381.40/x
  3. Step 3: Cross multiply
    389,780.40x = 584,233.20 × 221,381.40
  4. Step 4: Simplify right side
    389,780.40x = 129,338,363,742.48
  5. Step 5: Solve for x
    x = 129,338,363,742.48/389,780.40
  6. Step 6: Final answer
    x = 331,823.67

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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.