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Finding the Fourth Proportional to 114.30, 157.61 and 76.91

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Solution

The fourth proportional to 114.30, 157.61 and 76.91 is: 106.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.30 : 157.61 = 76.91 : x
  2. Step 2: Convert to fraction form
    114.30/157.61 = 76.91/x
  3. Step 3: Cross multiply
    114.30x = 157.61 × 76.91
  4. Step 4: Simplify right side
    114.30x = 12,121.19
  5. Step 5: Solve for x
    x = 12,121.19/114.30
  6. Step 6: Final answer
    x = 106.05

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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.