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Finding the Fourth Proportional to 287.56, 431.16 and 104.79

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Solution

The fourth proportional to 287.56, 431.16 and 104.79 is: 157.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.56 : 431.16 = 104.79 : x
  2. Step 2: Convert to fraction form
    287.56/431.16 = 104.79/x
  3. Step 3: Cross multiply
    287.56x = 431.16 × 104.79
  4. Step 4: Simplify right side
    287.56x = 45,181.26
  5. Step 5: Solve for x
    x = 45,181.26/287.56
  6. Step 6: Final answer
    x = 157.12

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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.