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Finding the Fourth Proportional to 222.91, 307.57 and 128.41

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Solution

The fourth proportional to 222.91, 307.57 and 128.41 is: 177.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.91 : 307.57 = 128.41 : x
  2. Step 2: Convert to fraction form
    222.91/307.57 = 128.41/x
  3. Step 3: Cross multiply
    222.91x = 307.57 × 128.41
  4. Step 4: Simplify right side
    222.91x = 39,495.13
  5. Step 5: Solve for x
    x = 39,495.13/222.91
  6. Step 6: Final answer
    x = 177.18

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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.