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Finding the Fourth Proportional to 391,459.20, 540,195.60 and 221,694.60

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Solution

The fourth proportional to 391,459.20, 540,195.60 and 221,694.60 is: 305,928.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,459.20 : 540,195.60 = 221,694.60 : x
  2. Step 2: Convert to fraction form
    391,459.20/540,195.60 = 221,694.60/x
  3. Step 3: Cross multiply
    391,459.20x = 540,195.60 × 221,694.60
  4. Step 4: Simplify right side
    391,459.20x = 119,758,447,463.76
  5. Step 5: Solve for x
    x = 119,758,447,463.76/391,459.20
  6. Step 6: Final answer
    x = 305,928.30

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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.