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Finding the Fourth Proportional to 807.20, 1,115.44 and 630.64

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Solution

The fourth proportional to 807.20, 1,115.44 and 630.64 is: 871.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.20 : 1,115.44 = 630.64 : x
  2. Step 2: Convert to fraction form
    807.20/1,115.44 = 630.64/x
  3. Step 3: Cross multiply
    807.20x = 1,115.44 × 630.64
  4. Step 4: Simplify right side
    807.20x = 703,441.08
  5. Step 5: Solve for x
    x = 703,441.08/807.20
  6. Step 6: Final answer
    x = 871.46

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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.