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Finding the Fourth Proportional to 287.37, 431.13 and 81.94

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Solution

The fourth proportional to 287.37, 431.13 and 81.94 is: 122.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.37 : 431.13 = 81.94 : x
  2. Step 2: Convert to fraction form
    287.37/431.13 = 81.94/x
  3. Step 3: Cross multiply
    287.37x = 431.13 × 81.94
  4. Step 4: Simplify right side
    287.37x = 35,327.02
  5. Step 5: Solve for x
    x = 35,327.02/287.37
  6. Step 6: Final answer
    x = 122.93

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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.