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Finding the Fourth Proportional to 391,453.84, 540,188.22 and 221,689.18

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Solution

The fourth proportional to 391,453.84, 540,188.22 and 221,689.18 is: 305,920.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,453.84 : 540,188.22 = 221,689.18 : x
  2. Step 2: Convert to fraction form
    391,453.84/540,188.22 = 221,689.18/x
  3. Step 3: Cross multiply
    391,453.84x = 540,188.22 × 221,689.18
  4. Step 4: Simplify right side
    391,453.84x = 119,753,883,537.46
  5. Step 5: Solve for x
    x = 119,753,883,537.46/391,453.84
  6. Step 6: Final answer
    x = 305,920.83

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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.