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Finding the Fourth Proportional to 875.14, 1,311.55 and 326.77

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Solution

The fourth proportional to 875.14, 1,311.55 and 326.77 is: 489.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.14 : 1,311.55 = 326.77 : x
  2. Step 2: Convert to fraction form
    875.14/1,311.55 = 326.77/x
  3. Step 3: Cross multiply
    875.14x = 1,311.55 × 326.77
  4. Step 4: Simplify right side
    875.14x = 428,571.10
  5. Step 5: Solve for x
    x = 428,571.10/875.14
  6. Step 6: Final answer
    x = 489.72

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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.