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Finding the Fourth Proportional to 326.64, 489.36 and 287.70

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Solution

The fourth proportional to 326.64, 489.36 and 287.70 is: 431.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.64 : 489.36 = 287.70 : x
  2. Step 2: Convert to fraction form
    326.64/489.36 = 287.70/x
  3. Step 3: Cross multiply
    326.64x = 489.36 × 287.70
  4. Step 4: Simplify right side
    326.64x = 140,788.87
  5. Step 5: Solve for x
    x = 140,788.87/326.64
  6. Step 6: Final answer
    x = 431.02

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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.