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Finding the Fourth Proportional to 287.90, 431.77 and 114.56

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Solution

The fourth proportional to 287.90, 431.77 and 114.56 is: 171.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.90 : 431.77 = 114.56 : x
  2. Step 2: Convert to fraction form
    287.90/431.77 = 114.56/x
  3. Step 3: Cross multiply
    287.90x = 431.77 × 114.56
  4. Step 4: Simplify right side
    287.90x = 49,463.57
  5. Step 5: Solve for x
    x = 49,463.57/287.90
  6. Step 6: Final answer
    x = 171.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.