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Finding the Fourth Proportional to 216.61, 326.99 and 215.39

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Solution

The fourth proportional to 216.61, 326.99 and 215.39 is: 325.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.61 : 326.99 = 215.39 : x
  2. Step 2: Convert to fraction form
    216.61/326.99 = 215.39/x
  3. Step 3: Cross multiply
    216.61x = 326.99 × 215.39
  4. Step 4: Simplify right side
    216.61x = 70,430.52
  5. Step 5: Solve for x
    x = 70,430.52/216.61
  6. Step 6: Final answer
    x = 325.15

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.