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Finding the Fourth Proportional to 114.30, 157.90 and 81.50

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Solution

The fourth proportional to 114.30, 157.90 and 81.50 is: 112.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.30 : 157.90 = 81.50 : x
  2. Step 2: Convert to fraction form
    114.30/157.90 = 81.50/x
  3. Step 3: Cross multiply
    114.30x = 157.90 × 81.50
  4. Step 4: Simplify right side
    114.30x = 12,868.85
  5. Step 5: Solve for x
    x = 12,868.85/114.30
  6. Step 6: Final answer
    x = 112.59

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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.