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Finding the Fourth Proportional to 312.79, 431.51 and 188.37

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Solution

The fourth proportional to 312.79, 431.51 and 188.37 is: 259.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.79 : 431.51 = 188.37 : x
  2. Step 2: Convert to fraction form
    312.79/431.51 = 188.37/x
  3. Step 3: Cross multiply
    312.79x = 431.51 × 188.37
  4. Step 4: Simplify right side
    312.79x = 81,284.01
  5. Step 5: Solve for x
    x = 81,284.01/312.79
  6. Step 6: Final answer
    x = 259.87

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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.