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Finding the Fourth Proportional to 312.92, 431.65 and 188.51

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Solution

The fourth proportional to 312.92, 431.65 and 188.51 is: 260.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.92 : 431.65 = 188.51 : x
  2. Step 2: Convert to fraction form
    312.92/431.65 = 188.51/x
  3. Step 3: Cross multiply
    312.92x = 431.65 × 188.51
  4. Step 4: Simplify right side
    312.92x = 81,370.95
  5. Step 5: Solve for x
    x = 81,370.95/312.92
  6. Step 6: Final answer
    x = 260.04

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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.