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Finding the Fourth Proportional to 122.85, 185.16 and 117.36

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Solution

The fourth proportional to 122.85, 185.16 and 117.36 is: 176.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.85 : 185.16 = 117.36 : x
  2. Step 2: Convert to fraction form
    122.85/185.16 = 117.36/x
  3. Step 3: Cross multiply
    122.85x = 185.16 × 117.36
  4. Step 4: Simplify right side
    122.85x = 21,730.82
  5. Step 5: Solve for x
    x = 21,730.82/122.85
  6. Step 6: Final answer
    x = 176.89

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.