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Finding the Fourth Proportional to 287.62, 431.06 and 104.79

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Solution

The fourth proportional to 287.62, 431.06 and 104.79 is: 157.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.62 : 431.06 = 104.79 : x
  2. Step 2: Convert to fraction form
    287.62/431.06 = 104.79/x
  3. Step 3: Cross multiply
    287.62x = 431.06 × 104.79
  4. Step 4: Simplify right side
    287.62x = 45,171.87
  5. Step 5: Solve for x
    x = 45,171.87/287.62
  6. Step 6: Final answer
    x = 157.06

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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.