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Finding the Fourth Proportional to 876.47, 1,315.22 and 321.12

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Solution

The fourth proportional to 876.47, 1,315.22 and 321.12 is: 481.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.47 : 1,315.22 = 321.12 : x
  2. Step 2: Convert to fraction form
    876.47/1,315.22 = 321.12/x
  3. Step 3: Cross multiply
    876.47x = 1,315.22 × 321.12
  4. Step 4: Simplify right side
    876.47x = 422,341.84
  5. Step 5: Solve for x
    x = 422,341.84/876.47
  6. Step 6: Final answer
    x = 481.87

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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.