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Finding the Fourth Proportional to 824.78, 1,237.40 and 338.18

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Solution

The fourth proportional to 824.78, 1,237.40 and 338.18 is: 507.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.78 : 1,237.40 = 338.18 : x
  2. Step 2: Convert to fraction form
    824.78/1,237.40 = 338.18/x
  3. Step 3: Cross multiply
    824.78x = 1,237.40 × 338.18
  4. Step 4: Simplify right side
    824.78x = 418,458.59
  5. Step 5: Solve for x
    x = 418,458.59/824.78
  6. Step 6: Final answer
    x = 507.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.