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Finding the Fourth Proportional to 117.64, 176.70 and 90.64

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Solution

The fourth proportional to 117.64, 176.70 and 90.64 is: 136.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.64 : 176.70 = 90.64 : x
  2. Step 2: Convert to fraction form
    117.64/176.70 = 90.64/x
  3. Step 3: Cross multiply
    117.64x = 176.70 × 90.64
  4. Step 4: Simplify right side
    117.64x = 16,016.09
  5. Step 5: Solve for x
    x = 16,016.09/117.64
  6. Step 6: Final answer
    x = 136.14

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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.