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Finding the Fourth Proportional to 114.16, 157.44 and 87.90

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Solution

The fourth proportional to 114.16, 157.44 and 87.90 is: 121.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.16 : 157.44 = 87.90 : x
  2. Step 2: Convert to fraction form
    114.16/157.44 = 87.90/x
  3. Step 3: Cross multiply
    114.16x = 157.44 × 87.90
  4. Step 4: Simplify right side
    114.16x = 13,839.60
  5. Step 5: Solve for x
    x = 13,839.60/114.16
  6. Step 6: Final answer
    x = 121.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.