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Finding the Fourth Proportional to 824.86, 1,137.66 and 493.21

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Solution

The fourth proportional to 824.86, 1,137.66 and 493.21 is: 680.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.86 : 1,137.66 = 493.21 : x
  2. Step 2: Convert to fraction form
    824.86/1,137.66 = 493.21/x
  3. Step 3: Cross multiply
    824.86x = 1,137.66 × 493.21
  4. Step 4: Simplify right side
    824.86x = 561,105.29
  5. Step 5: Solve for x
    x = 561,105.29/824.86
  6. Step 6: Final answer
    x = 680.24

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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.