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Finding the Fourth Proportional to 287.59, 431.39 and 104.87

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Solution

The fourth proportional to 287.59, 431.39 and 104.87 is: 157.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.59 : 431.39 = 104.87 : x
  2. Step 2: Convert to fraction form
    287.59/431.39 = 104.87/x
  3. Step 3: Cross multiply
    287.59x = 431.39 × 104.87
  4. Step 4: Simplify right side
    287.59x = 45,239.87
  5. Step 5: Solve for x
    x = 45,239.87/287.59
  6. Step 6: Final answer
    x = 157.31

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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.