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Finding the Fourth Proportional to 151.08, 208.53 and 98.70

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Solution

The fourth proportional to 151.08, 208.53 and 98.70 is: 136.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.08 : 208.53 = 98.70 : x
  2. Step 2: Convert to fraction form
    151.08/208.53 = 98.70/x
  3. Step 3: Cross multiply
    151.08x = 208.53 × 98.70
  4. Step 4: Simplify right side
    151.08x = 20,581.91
  5. Step 5: Solve for x
    x = 20,581.91/151.08
  6. Step 6: Final answer
    x = 136.23

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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.