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Finding the Fourth Proportional to 209.68, 289.28 and 151.52

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Solution

The fourth proportional to 209.68, 289.28 and 151.52 is: 209.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.68 : 289.28 = 151.52 : x
  2. Step 2: Convert to fraction form
    209.68/289.28 = 151.52/x
  3. Step 3: Cross multiply
    209.68x = 289.28 × 151.52
  4. Step 4: Simplify right side
    209.68x = 43,831.71
  5. Step 5: Solve for x
    x = 43,831.71/209.68
  6. Step 6: Final answer
    x = 209.04

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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.