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Finding the Fourth Proportional to 117.36, 175.68 and 85.20

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Solution

The fourth proportional to 117.36, 175.68 and 85.20 is: 127.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.36 : 175.68 = 85.20 : x
  2. Step 2: Convert to fraction form
    117.36/175.68 = 85.20/x
  3. Step 3: Cross multiply
    117.36x = 175.68 × 85.20
  4. Step 4: Simplify right side
    117.36x = 14,967.94
  5. Step 5: Solve for x
    x = 14,967.94/117.36
  6. Step 6: Final answer
    x = 127.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.