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Finding the Fourth Proportional to 117.60, 175.19 and 111.71

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Solution

The fourth proportional to 117.60, 175.19 and 111.71 is: 166.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.60 : 175.19 = 111.71 : x
  2. Step 2: Convert to fraction form
    117.60/175.19 = 111.71/x
  3. Step 3: Cross multiply
    117.60x = 175.19 × 111.71
  4. Step 4: Simplify right side
    117.60x = 19,569.04
  5. Step 5: Solve for x
    x = 19,569.04/117.60
  6. Step 6: Final answer
    x = 166.40

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.