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Finding the Fourth Proportional to 815.78, 1,133.50 and 807.22

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Solution

The fourth proportional to 815.78, 1,133.50 and 807.22 is: 1,121.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.78 : 1,133.50 = 807.22 : x
  2. Step 2: Convert to fraction form
    815.78/1,133.50 = 807.22/x
  3. Step 3: Cross multiply
    815.78x = 1,133.50 × 807.22
  4. Step 4: Simplify right side
    815.78x = 914,983.87
  5. Step 5: Solve for x
    x = 914,983.87/815.78
  6. Step 6: Final answer
    x = 1,121.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.