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Finding the Fourth Proportional to 114.86, 158.55 and 85.79

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Solution

The fourth proportional to 114.86, 158.55 and 85.79 is: 118.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.86 : 158.55 = 85.79 : x
  2. Step 2: Convert to fraction form
    114.86/158.55 = 85.79/x
  3. Step 3: Cross multiply
    114.86x = 158.55 × 85.79
  4. Step 4: Simplify right side
    114.86x = 13,602.00
  5. Step 5: Solve for x
    x = 13,602.00/114.86
  6. Step 6: Final answer
    x = 118.42

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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.