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Finding the Fourth Proportional to 312.87, 431.65 and 188.43

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Solution

The fourth proportional to 312.87, 431.65 and 188.43 is: 259.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.87 : 431.65 = 188.43 : x
  2. Step 2: Convert to fraction form
    312.87/431.65 = 188.43/x
  3. Step 3: Cross multiply
    312.87x = 431.65 × 188.43
  4. Step 4: Simplify right side
    312.87x = 81,335.81
  5. Step 5: Solve for x
    x = 81,335.81/312.87
  6. Step 6: Final answer
    x = 259.97

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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.