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Finding the Fourth Proportional to 116.72, 174.93 and 87.60

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Solution

The fourth proportional to 116.72, 174.93 and 87.60 is: 131.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.72 : 174.93 = 87.60 : x
  2. Step 2: Convert to fraction form
    116.72/174.93 = 87.60/x
  3. Step 3: Cross multiply
    116.72x = 174.93 × 87.60
  4. Step 4: Simplify right side
    116.72x = 15,323.87
  5. Step 5: Solve for x
    x = 15,323.87/116.72
  6. Step 6: Final answer
    x = 131.28

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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.