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Finding the Fourth Proportional to 879.89, 1,320.12 and 332.12

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Solution

The fourth proportional to 879.89, 1,320.12 and 332.12 is: 498.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.89 : 1,320.12 = 332.12 : x
  2. Step 2: Convert to fraction form
    879.89/1,320.12 = 332.12/x
  3. Step 3: Cross multiply
    879.89x = 1,320.12 × 332.12
  4. Step 4: Simplify right side
    879.89x = 438,431.65
  5. Step 5: Solve for x
    x = 438,431.65/879.89
  6. Step 6: Final answer
    x = 498.28

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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.