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Finding the Fourth Proportional to 312.32, 431.08 and 188

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Solution

The fourth proportional to 312.32, 431.08 and 188 is: 259.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.32 : 431.08 = 188 : x
  2. Step 2: Convert to fraction form
    312.32/431.08 = 188/x
  3. Step 3: Cross multiply
    312.32x = 431.08 × 188
  4. Step 4: Simplify right side
    312.32x = 81,043.04
  5. Step 5: Solve for x
    x = 81,043.04/312.32
  6. Step 6: Final answer
    x = 259.49

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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.