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Finding the Fourth Proportional to 892.50, 1,338.75 and 315.39

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Solution

The fourth proportional to 892.50, 1,338.75 and 315.39 is: 473.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.50 : 1,338.75 = 315.39 : x
  2. Step 2: Convert to fraction form
    892.50/1,338.75 = 315.39/x
  3. Step 3: Cross multiply
    892.50x = 1,338.75 × 315.39
  4. Step 4: Simplify right side
    892.50x = 422,228.36
  5. Step 5: Solve for x
    x = 422,228.36/892.50
  6. Step 6: Final answer
    x = 473.09

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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.