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Finding the Fourth Proportional to 117.34, 175.40 and 91.36

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Solution

The fourth proportional to 117.34, 175.40 and 91.36 is: 136.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.34 : 175.40 = 91.36 : x
  2. Step 2: Convert to fraction form
    117.34/175.40 = 91.36/x
  3. Step 3: Cross multiply
    117.34x = 175.40 × 91.36
  4. Step 4: Simplify right side
    117.34x = 16,024.54
  5. Step 5: Solve for x
    x = 16,024.54/117.34
  6. Step 6: Final answer
    x = 136.57

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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.