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Finding the Fourth Proportional to 824.02, 1,145.22 and 815.38

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Solution

The fourth proportional to 824.02, 1,145.22 and 815.38 is: 1,133.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.02 : 1,145.22 = 815.38 : x
  2. Step 2: Convert to fraction form
    824.02/1,145.22 = 815.38/x
  3. Step 3: Cross multiply
    824.02x = 1,145.22 × 815.38
  4. Step 4: Simplify right side
    824.02x = 933,785.41
  5. Step 5: Solve for x
    x = 933,785.41/824.02
  6. Step 6: Final answer
    x = 1,133.21

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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.