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Finding the Fourth Proportional to 114.60, 171.81 and 78.42

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Solution

The fourth proportional to 114.60, 171.81 and 78.42 is: 117.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.60 : 171.81 = 78.42 : x
  2. Step 2: Convert to fraction form
    114.60/171.81 = 78.42/x
  3. Step 3: Cross multiply
    114.60x = 171.81 × 78.42
  4. Step 4: Simplify right side
    114.60x = 13,473.34
  5. Step 5: Solve for x
    x = 13,473.34/114.60
  6. Step 6: Final answer
    x = 117.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.