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Finding the Fourth Proportional to 114.42, 171.72 and 78.60

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Solution

The fourth proportional to 114.42, 171.72 and 78.60 is: 117.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.42 : 171.72 = 78.60 : x
  2. Step 2: Convert to fraction form
    114.42/171.72 = 78.60/x
  3. Step 3: Cross multiply
    114.42x = 171.72 × 78.60
  4. Step 4: Simplify right side
    114.42x = 13,497.19
  5. Step 5: Solve for x
    x = 13,497.19/114.42
  6. Step 6: Final answer
    x = 117.96

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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.