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Finding the Fourth Proportional to 222.64, 307.24 and 129.31

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Solution

The fourth proportional to 222.64, 307.24 and 129.31 is: 178.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.64 : 307.24 = 129.31 : x
  2. Step 2: Convert to fraction form
    222.64/307.24 = 129.31/x
  3. Step 3: Cross multiply
    222.64x = 307.24 × 129.31
  4. Step 4: Simplify right side
    222.64x = 39,728.11
  5. Step 5: Solve for x
    x = 39,728.11/222.64
  6. Step 6: Final answer
    x = 178.44

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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.