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Finding the Fourth Proportional to 223.18, 307.98 and 129.92

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Solution

The fourth proportional to 223.18, 307.98 and 129.92 is: 179.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.18 : 307.98 = 129.92 : x
  2. Step 2: Convert to fraction form
    223.18/307.98 = 129.92/x
  3. Step 3: Cross multiply
    223.18x = 307.98 × 129.92
  4. Step 4: Simplify right side
    223.18x = 40,012.76
  5. Step 5: Solve for x
    x = 40,012.76/223.18
  6. Step 6: Final answer
    x = 179.28

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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.