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Finding the Fourth Proportional to 471.08, 706.54 and 129

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Solution

The fourth proportional to 471.08, 706.54 and 129 is: 193.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    471.08 : 706.54 = 129 : x
  2. Step 2: Convert to fraction form
    471.08/706.54 = 129/x
  3. Step 3: Cross multiply
    471.08x = 706.54 × 129
  4. Step 4: Simplify right side
    471.08x = 91,143.66
  5. Step 5: Solve for x
    x = 91,143.66/471.08
  6. Step 6: Final answer
    x = 193.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.