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Finding the Fourth Proportional to 114.22, 171.12 and 78.16

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Solution

The fourth proportional to 114.22, 171.12 and 78.16 is: 117.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.22 : 171.12 = 78.16 : x
  2. Step 2: Convert to fraction form
    114.22/171.12 = 78.16/x
  3. Step 3: Cross multiply
    114.22x = 171.12 × 78.16
  4. Step 4: Simplify right side
    114.22x = 13,374.74
  5. Step 5: Solve for x
    x = 13,374.74/114.22
  6. Step 6: Final answer
    x = 117.10

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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.