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Finding the Fourth Proportional to 639,080.80, 958,621.20 and 440,015.20

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Solution

The fourth proportional to 639,080.80, 958,621.20 and 440,015.20 is: 660,022.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,080.80 : 958,621.20 = 440,015.20 : x
  2. Step 2: Convert to fraction form
    639,080.80/958,621.20 = 440,015.20/x
  3. Step 3: Cross multiply
    639,080.80x = 958,621.20 × 440,015.20
  4. Step 4: Simplify right side
    639,080.80x = 421,807,899,042.24
  5. Step 5: Solve for x
    x = 421,807,899,042.24/639,080.80
  6. Step 6: Final answer
    x = 660,022.80

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Double scale
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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.