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Finding the Fourth Proportional to 391,604.32, 540,500.88 and 221,932

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Solution

The fourth proportional to 391,604.32, 540,500.88 and 221,932 is: 306,315.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,604.32 : 540,500.88 = 221,932 : x
  2. Step 2: Convert to fraction form
    391,604.32/540,500.88 = 221,932/x
  3. Step 3: Cross multiply
    391,604.32x = 540,500.88 × 221,932
  4. Step 4: Simplify right side
    391,604.32x = 119,954,441,300.16
  5. Step 5: Solve for x
    x = 119,954,441,300.16/391,604.32
  6. Step 6: Final answer
    x = 306,315.42

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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.