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Finding the Fourth Proportional to 151.42, 208.90 and 85.89

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Solution

The fourth proportional to 151.42, 208.90 and 85.89 is: 118.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.42 : 208.90 = 85.89 : x
  2. Step 2: Convert to fraction form
    151.42/208.90 = 85.89/x
  3. Step 3: Cross multiply
    151.42x = 208.90 × 85.89
  4. Step 4: Simplify right side
    151.42x = 17,941.79
  5. Step 5: Solve for x
    x = 17,941.79/151.42
  6. Step 6: Final answer
    x = 118.49

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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.