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Finding the Fourth Proportional to 326.34, 489.45 and 143.58

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Solution

The fourth proportional to 326.34, 489.45 and 143.58 is: 215.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.34 : 489.45 = 143.58 : x
  2. Step 2: Convert to fraction form
    326.34/489.45 = 143.58/x
  3. Step 3: Cross multiply
    326.34x = 489.45 × 143.58
  4. Step 4: Simplify right side
    326.34x = 70,275.23
  5. Step 5: Solve for x
    x = 70,275.23/326.34
  6. Step 6: Final answer
    x = 215.34

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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.