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Finding the Fourth Proportional to 326.61, 489.92 and 131.63

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Solution

The fourth proportional to 326.61, 489.92 and 131.63 is: 197.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.61 : 489.92 = 131.63 : x
  2. Step 2: Convert to fraction form
    326.61/489.92 = 131.63/x
  3. Step 3: Cross multiply
    326.61x = 489.92 × 131.63
  4. Step 4: Simplify right side
    326.61x = 64,488.50
  5. Step 5: Solve for x
    x = 64,488.50/326.61
  6. Step 6: Final answer
    x = 197.45

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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.