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Finding the Fourth Proportional to 114.69, 172.30 and 87.36

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Solution

The fourth proportional to 114.69, 172.30 and 87.36 is: 131.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.69 : 172.30 = 87.36 : x
  2. Step 2: Convert to fraction form
    114.69/172.30 = 87.36/x
  3. Step 3: Cross multiply
    114.69x = 172.30 × 87.36
  4. Step 4: Simplify right side
    114.69x = 15,052.13
  5. Step 5: Solve for x
    x = 15,052.13/114.69
  6. Step 6: Final answer
    x = 131.24

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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.