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Finding the Fourth Proportional to 312.72, 431.47 and 188.32

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Solution

The fourth proportional to 312.72, 431.47 and 188.32 is: 259.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.72 : 431.47 = 188.32 : x
  2. Step 2: Convert to fraction form
    312.72/431.47 = 188.32/x
  3. Step 3: Cross multiply
    312.72x = 431.47 × 188.32
  4. Step 4: Simplify right side
    312.72x = 81,254.43
  5. Step 5: Solve for x
    x = 81,254.43/312.72
  6. Step 6: Final answer
    x = 259.83

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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.