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Finding the Fourth Proportional to 391,420.80, 540,172.80 and 221,651.20

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Solution

The fourth proportional to 391,420.80, 540,172.80 and 221,651.20 is: 305,885.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,420.80 : 540,172.80 = 221,651.20 : x
  2. Step 2: Convert to fraction form
    391,420.80/540,172.80 = 221,651.20/x
  3. Step 3: Cross multiply
    391,420.80x = 540,172.80 × 221,651.20
  4. Step 4: Simplify right side
    391,420.80x = 119,729,949,327.36
  5. Step 5: Solve for x
    x = 119,729,949,327.36/391,420.80
  6. Step 6: Final answer
    x = 305,885.51

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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.