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Finding the Fourth Proportional to 104.90, 157.14 and 87.75

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Solution

The fourth proportional to 104.90, 157.14 and 87.75 is: 131.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.90 : 157.14 = 87.75 : x
  2. Step 2: Convert to fraction form
    104.90/157.14 = 87.75/x
  3. Step 3: Cross multiply
    104.90x = 157.14 × 87.75
  4. Step 4: Simplify right side
    104.90x = 13,789.04
  5. Step 5: Solve for x
    x = 13,789.04/104.90
  6. Step 6: Final answer
    x = 131.46

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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.