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Finding the Fourth Proportional to 287.95, 431.91 and 102.85

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Solution

The fourth proportional to 287.95, 431.91 and 102.85 is: 154.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.95 : 431.91 = 102.85 : x
  2. Step 2: Convert to fraction form
    287.95/431.91 = 102.85/x
  3. Step 3: Cross multiply
    287.95x = 431.91 × 102.85
  4. Step 4: Simplify right side
    287.95x = 44,419.78
  5. Step 5: Solve for x
    x = 44,419.78/287.95
  6. Step 6: Final answer
    x = 154.26

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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.