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Finding the Fourth Proportional to 807.20, 1,112.64 and 632.24

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Solution

The fourth proportional to 807.20, 1,112.64 and 632.24 is: 871.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.20 : 1,112.64 = 632.24 : x
  2. Step 2: Convert to fraction form
    807.20/1,112.64 = 632.24/x
  3. Step 3: Cross multiply
    807.20x = 1,112.64 × 632.24
  4. Step 4: Simplify right side
    807.20x = 703,455.51
  5. Step 5: Solve for x
    x = 703,455.51/807.20
  6. Step 6: Final answer
    x = 871.48

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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.