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Finding the Fourth Proportional to 326.52, 489.87 and 290.70

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Solution

The fourth proportional to 326.52, 489.87 and 290.70 is: 436.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.52 : 489.87 = 290.70 : x
  2. Step 2: Convert to fraction form
    326.52/489.87 = 290.70/x
  3. Step 3: Cross multiply
    326.52x = 489.87 × 290.70
  4. Step 4: Simplify right side
    326.52x = 142,405.21
  5. Step 5: Solve for x
    x = 142,405.21/326.52
  6. Step 6: Final answer
    x = 436.13

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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.