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Finding the Fourth Proportional to 222.76, 307.40 and 129.51

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Solution

The fourth proportional to 222.76, 307.40 and 129.51 is: 178.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.76 : 307.40 = 129.51 : x
  2. Step 2: Convert to fraction form
    222.76/307.40 = 129.51/x
  3. Step 3: Cross multiply
    222.76x = 307.40 × 129.51
  4. Step 4: Simplify right side
    222.76x = 39,811.37
  5. Step 5: Solve for x
    x = 39,811.37/222.76
  6. Step 6: Final answer
    x = 178.72

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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.