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Finding the Fourth Proportional to 391,170.72, 539,801.60 and 221,401.20

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Solution

The fourth proportional to 391,170.72, 539,801.60 and 221,401.20 is: 305,525.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,170.72 : 539,801.60 = 221,401.20 : x
  2. Step 2: Convert to fraction form
    391,170.72/539,801.60 = 221,401.20/x
  3. Step 3: Cross multiply
    391,170.72x = 539,801.60 × 221,401.20
  4. Step 4: Simplify right side
    391,170.72x = 119,512,722,001.92
  5. Step 5: Solve for x
    x = 119,512,722,001.92/391,170.72
  6. Step 6: Final answer
    x = 305,525.74

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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.