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Finding the Fourth Proportional to 720,003.20, 1,080,004.80 and 639,132.80

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Solution

The fourth proportional to 720,003.20, 1,080,004.80 and 639,132.80 is: 958,699.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,003.20 : 1,080,004.80 = 639,132.80 : x
  2. Step 2: Convert to fraction form
    720,003.20/1,080,004.80 = 639,132.80/x
  3. Step 3: Cross multiply
    720,003.20x = 1,080,004.80 × 639,132.80
  4. Step 4: Simplify right side
    720,003.20x = 690,266,491,837.44
  5. Step 5: Solve for x
    x = 690,266,491,837.44/720,003.20
  6. Step 6: Final answer
    x = 958,699.20

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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.