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Finding the Fourth Proportional to 312.52, 431.18 and 188.14

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Solution

The fourth proportional to 312.52, 431.18 and 188.14 is: 259.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.52 : 431.18 = 188.14 : x
  2. Step 2: Convert to fraction form
    312.52/431.18 = 188.14/x
  3. Step 3: Cross multiply
    312.52x = 431.18 × 188.14
  4. Step 4: Simplify right side
    312.52x = 81,122.21
  5. Step 5: Solve for x
    x = 81,122.21/312.52
  6. Step 6: Final answer
    x = 259.57

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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.