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Finding the Fourth Proportional to 824.32, 1,242.20 and 816.96

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Solution

The fourth proportional to 824.32, 1,242.20 and 816.96 is: 1,231.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.32 : 1,242.20 = 816.96 : x
  2. Step 2: Convert to fraction form
    824.32/1,242.20 = 816.96/x
  3. Step 3: Cross multiply
    824.32x = 1,242.20 × 816.96
  4. Step 4: Simplify right side
    824.32x = 1,014,827.71
  5. Step 5: Solve for x
    x = 1,014,827.71/824.32
  6. Step 6: Final answer
    x = 1,231.11

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.