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Finding the Fourth Proportional to 287.70, 431.57 and 114.28

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Solution

The fourth proportional to 287.70, 431.57 and 114.28 is: 171.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.70 : 431.57 = 114.28 : x
  2. Step 2: Convert to fraction form
    287.70/431.57 = 114.28/x
  3. Step 3: Cross multiply
    287.70x = 431.57 × 114.28
  4. Step 4: Simplify right side
    287.70x = 49,319.82
  5. Step 5: Solve for x
    x = 49,319.82/287.70
  6. Step 6: Final answer
    x = 171.43

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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.