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Finding the Fourth Proportional to 128.58, 176.44 and 117.70

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Solution

The fourth proportional to 128.58, 176.44 and 117.70 is: 161.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.58 : 176.44 = 117.70 : x
  2. Step 2: Convert to fraction form
    128.58/176.44 = 117.70/x
  3. Step 3: Cross multiply
    128.58x = 176.44 × 117.70
  4. Step 4: Simplify right side
    128.58x = 20,766.99
  5. Step 5: Solve for x
    x = 20,766.99/128.58
  6. Step 6: Final answer
    x = 161.51

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.