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Finding the Fourth Proportional to 312.94, 431.92 and 188.66

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Solution

The fourth proportional to 312.94, 431.92 and 188.66 is: 260.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.94 : 431.92 = 188.66 : x
  2. Step 2: Convert to fraction form
    312.94/431.92 = 188.66/x
  3. Step 3: Cross multiply
    312.94x = 431.92 × 188.66
  4. Step 4: Simplify right side
    312.94x = 81,486.03
  5. Step 5: Solve for x
    x = 81,486.03/312.94
  6. Step 6: Final answer
    x = 260.39

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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.