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Finding the Fourth Proportional to 223.16, 307.91 and 128.66

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Solution

The fourth proportional to 223.16, 307.91 and 128.66 is: 177.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.16 : 307.91 = 128.66 : x
  2. Step 2: Convert to fraction form
    223.16/307.91 = 128.66/x
  3. Step 3: Cross multiply
    223.16x = 307.91 × 128.66
  4. Step 4: Simplify right side
    223.16x = 39,615.70
  5. Step 5: Solve for x
    x = 39,615.70/223.16
  6. Step 6: Final answer
    x = 177.52

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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.