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Finding the Fourth Proportional to 151.64, 209.28 and 101.86

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Solution

The fourth proportional to 151.64, 209.28 and 101.86 is: 140.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.64 : 209.28 = 101.86 : x
  2. Step 2: Convert to fraction form
    151.64/209.28 = 101.86/x
  3. Step 3: Cross multiply
    151.64x = 209.28 × 101.86
  4. Step 4: Simplify right side
    151.64x = 21,317.12
  5. Step 5: Solve for x
    x = 21,317.12/151.64
  6. Step 6: Final answer
    x = 140.58

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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.