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Finding the Fourth Proportional to 222.56, 307.16 and 129.32

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Solution

The fourth proportional to 222.56, 307.16 and 129.32 is: 178.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.56 : 307.16 = 129.32 : x
  2. Step 2: Convert to fraction form
    222.56/307.16 = 129.32/x
  3. Step 3: Cross multiply
    222.56x = 307.16 × 129.32
  4. Step 4: Simplify right side
    222.56x = 39,721.93
  5. Step 5: Solve for x
    x = 39,721.93/222.56
  6. Step 6: Final answer
    x = 178.48

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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.