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Finding the Fourth Proportional to 216.77, 299.11 and 129.47

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Solution

The fourth proportional to 216.77, 299.11 and 129.47 is: 178.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.77 : 299.11 = 129.47 : x
  2. Step 2: Convert to fraction form
    216.77/299.11 = 129.47/x
  3. Step 3: Cross multiply
    216.77x = 299.11 × 129.47
  4. Step 4: Simplify right side
    216.77x = 38,723.63
  5. Step 5: Solve for x
    x = 38,723.63/216.77
  6. Step 6: Final answer
    x = 178.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.