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Finding the Fourth Proportional to 326.07, 489.08 and 143.47

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Solution

The fourth proportional to 326.07, 489.08 and 143.47 is: 215.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.07 : 489.08 = 143.47 : x
  2. Step 2: Convert to fraction form
    326.07/489.08 = 143.47/x
  3. Step 3: Cross multiply
    326.07x = 489.08 × 143.47
  4. Step 4: Simplify right side
    326.07x = 70,165.86
  5. Step 5: Solve for x
    x = 70,165.86/326.07
  6. Step 6: Final answer
    x = 215.19

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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.