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Finding the Fourth Proportional to 287.73, 431.55 and 92.72

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Solution

The fourth proportional to 287.73, 431.55 and 92.72 is: 139.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.73 : 431.55 = 92.72 : x
  2. Step 2: Convert to fraction form
    287.73/431.55 = 92.72/x
  3. Step 3: Cross multiply
    287.73x = 431.55 × 92.72
  4. Step 4: Simplify right side
    287.73x = 40,014.39
  5. Step 5: Solve for x
    x = 40,014.39/287.73
  6. Step 6: Final answer
    x = 139.07

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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.