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Finding the Fourth Proportional to 287.55, 431.46 and 218.43

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Solution

The fourth proportional to 287.55, 431.46 and 218.43 is: 327.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.55 : 431.46 = 218.43 : x
  2. Step 2: Convert to fraction form
    287.55/431.46 = 218.43/x
  3. Step 3: Cross multiply
    287.55x = 431.46 × 218.43
  4. Step 4: Simplify right side
    287.55x = 94,243.81
  5. Step 5: Solve for x
    x = 94,243.81/287.55
  6. Step 6: Final answer
    x = 327.75

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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.