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Finding the Fourth Proportional to 151.70, 209.52 and 105.21

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Solution

The fourth proportional to 151.70, 209.52 and 105.21 is: 145.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.70 : 209.52 = 105.21 : x
  2. Step 2: Convert to fraction form
    151.70/209.52 = 105.21/x
  3. Step 3: Cross multiply
    151.70x = 209.52 × 105.21
  4. Step 4: Simplify right side
    151.70x = 22,043.60
  5. Step 5: Solve for x
    x = 22,043.60/151.70
  6. Step 6: Final answer
    x = 145.32

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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.