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Finding the Fourth Proportional to 287.80, 431.87 and 164.57

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Solution

The fourth proportional to 287.80, 431.87 and 164.57 is: 246.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.80 : 431.87 = 164.57 : x
  2. Step 2: Convert to fraction form
    287.80/431.87 = 164.57/x
  3. Step 3: Cross multiply
    287.80x = 431.87 × 164.57
  4. Step 4: Simplify right side
    287.80x = 71,069.86
  5. Step 5: Solve for x
    x = 71,069.86/287.80
  6. Step 6: Final answer
    x = 246.94

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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.