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Finding the Fourth Proportional to 216.80, 325.19 and 70.55

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Solution

The fourth proportional to 216.80, 325.19 and 70.55 is: 105.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.80 : 325.19 = 70.55 : x
  2. Step 2: Convert to fraction form
    216.80/325.19 = 70.55/x
  3. Step 3: Cross multiply
    216.80x = 325.19 × 70.55
  4. Step 4: Simplify right side
    216.80x = 22,941.66
  5. Step 5: Solve for x
    x = 22,941.66/216.80
  6. Step 6: Final answer
    x = 105.82

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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.