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Finding the Fourth Proportional to 114.20, 157.54 and 74.89

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Solution

The fourth proportional to 114.20, 157.54 and 74.89 is: 103.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.20 : 157.54 = 74.89 : x
  2. Step 2: Convert to fraction form
    114.20/157.54 = 74.89/x
  3. Step 3: Cross multiply
    114.20x = 157.54 × 74.89
  4. Step 4: Simplify right side
    114.20x = 11,797.43
  5. Step 5: Solve for x
    x = 11,797.43/114.20
  6. Step 6: Final answer
    x = 103.30

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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.