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Finding the Fourth Proportional to 326.20, 489.30 and 210.70

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Solution

The fourth proportional to 326.20, 489.30 and 210.70 is: 316.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.20 : 489.30 = 210.70 : x
  2. Step 2: Convert to fraction form
    326.20/489.30 = 210.70/x
  3. Step 3: Cross multiply
    326.20x = 489.30 × 210.70
  4. Step 4: Simplify right side
    326.20x = 103,095.51
  5. Step 5: Solve for x
    x = 103,095.51/326.20
  6. Step 6: Final answer
    x = 316.05

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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.