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Finding the Fourth Proportional to 117.90, 161.85 and 117.54

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Solution

The fourth proportional to 117.90, 161.85 and 117.54 is: 161.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.90 : 161.85 = 117.54 : x
  2. Step 2: Convert to fraction form
    117.90/161.85 = 117.54/x
  3. Step 3: Cross multiply
    117.90x = 161.85 × 117.54
  4. Step 4: Simplify right side
    117.90x = 19,023.85
  5. Step 5: Solve for x
    x = 19,023.85/117.90
  6. Step 6: Final answer
    x = 161.36

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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.