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Finding the Fourth Proportional to 151.11, 208.51 and 85.60

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Solution

The fourth proportional to 151.11, 208.51 and 85.60 is: 118.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.11 : 208.51 = 85.60 : x
  2. Step 2: Convert to fraction form
    151.11/208.51 = 85.60/x
  3. Step 3: Cross multiply
    151.11x = 208.51 × 85.60
  4. Step 4: Simplify right side
    151.11x = 17,848.46
  5. Step 5: Solve for x
    x = 17,848.46/151.11
  6. Step 6: Final answer
    x = 118.12

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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.