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Finding the Fourth Proportional to 151.69, 209.26 and 128.30

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Solution

The fourth proportional to 151.69, 209.26 and 128.30 is: 176.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.69 : 209.26 = 128.30 : x
  2. Step 2: Convert to fraction form
    151.69/209.26 = 128.30/x
  3. Step 3: Cross multiply
    151.69x = 209.26 × 128.30
  4. Step 4: Simplify right side
    151.69x = 26,847.99
  5. Step 5: Solve for x
    x = 26,847.99/151.69
  6. Step 6: Final answer
    x = 176.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.