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Finding the Fourth Proportional to 113.90, 156.15 and 111.85

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Solution

The fourth proportional to 113.90, 156.15 and 111.85 is: 153.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.90 : 156.15 = 111.85 : x
  2. Step 2: Convert to fraction form
    113.90/156.15 = 111.85/x
  3. Step 3: Cross multiply
    113.90x = 156.15 × 111.85
  4. Step 4: Simplify right side
    113.90x = 17,464.99
  5. Step 5: Solve for x
    x = 17,464.99/113.90
  6. Step 6: Final answer
    x = 153.34

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.