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Finding the Fourth Proportional to 222.92, 307.67 and 128.39

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Solution

The fourth proportional to 222.92, 307.67 and 128.39 is: 177.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.92 : 307.67 = 128.39 : x
  2. Step 2: Convert to fraction form
    222.92/307.67 = 128.39/x
  3. Step 3: Cross multiply
    222.92x = 307.67 × 128.39
  4. Step 4: Simplify right side
    222.92x = 39,501.11
  5. Step 5: Solve for x
    x = 39,501.11/222.92
  6. Step 6: Final answer
    x = 177.20

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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.