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Finding the Fourth Proportional to 117.93, 176.49 and 90.81

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Solution

The fourth proportional to 117.93, 176.49 and 90.81 is: 135.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.93 : 176.49 = 90.81 : x
  2. Step 2: Convert to fraction form
    117.93/176.49 = 90.81/x
  3. Step 3: Cross multiply
    117.93x = 176.49 × 90.81
  4. Step 4: Simplify right side
    117.93x = 16,027.06
  5. Step 5: Solve for x
    x = 16,027.06/117.93
  6. Step 6: Final answer
    x = 135.90

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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.