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Finding the Fourth Proportional to 417,991.20, 626,986.80 and 311,546.40

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Solution

The fourth proportional to 417,991.20, 626,986.80 and 311,546.40 is: 467,319.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    417,991.20 : 626,986.80 = 311,546.40 : x
  2. Step 2: Convert to fraction form
    417,991.20/626,986.80 = 311,546.40/x
  3. Step 3: Cross multiply
    417,991.20x = 626,986.80 × 311,546.40
  4. Step 4: Simplify right side
    417,991.20x = 195,335,480,387.52
  5. Step 5: Solve for x
    x = 195,335,480,387.52/417,991.20
  6. Step 6: Final answer
    x = 467,319.60

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.