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Finding the Fourth Proportional to 312.49, 431.22 and 188.11

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Solution

The fourth proportional to 312.49, 431.22 and 188.11 is: 259.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.49 : 431.22 = 188.11 : x
  2. Step 2: Convert to fraction form
    312.49/431.22 = 188.11/x
  3. Step 3: Cross multiply
    312.49x = 431.22 × 188.11
  4. Step 4: Simplify right side
    312.49x = 81,116.79
  5. Step 5: Solve for x
    x = 81,116.79/312.49
  6. Step 6: Final answer
    x = 259.58

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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.