Home / 391,721.84-540,545.64-221,982.56

Finding the Fourth Proportional to 391,721.84, 540,545.64 and 221,982.56

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Solution

The fourth proportional to 391,721.84, 540,545.64 and 221,982.56 is: 306,318.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,721.84 : 540,545.64 = 221,982.56 : x
  2. Step 2: Convert to fraction form
    391,721.84/540,545.64 = 221,982.56/x
  3. Step 3: Cross multiply
    391,721.84x = 540,545.64 × 221,982.56
  4. Step 4: Simplify right side
    391,721.84x = 119,991,704,964.04
  5. Step 5: Solve for x
    x = 119,991,704,964.04/391,721.84
  6. Step 6: Final answer
    x = 306,318.65

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1.5x scale

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.