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Finding the Fourth Proportional to 312.38, 431.06 and 187.98

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Solution

The fourth proportional to 312.38, 431.06 and 187.98 is: 259.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.38 : 431.06 = 187.98 : x
  2. Step 2: Convert to fraction form
    312.38/431.06 = 187.98/x
  3. Step 3: Cross multiply
    312.38x = 431.06 × 187.98
  4. Step 4: Simplify right side
    312.38x = 81,030.66
  5. Step 5: Solve for x
    x = 81,030.66/312.38
  6. Step 6: Final answer
    x = 259.40

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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.