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Finding the Fourth Proportional to 114.73, 172.13 and 78.31

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Solution

The fourth proportional to 114.73, 172.13 and 78.31 is: 117.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.73 : 172.13 = 78.31 : x
  2. Step 2: Convert to fraction form
    114.73/172.13 = 78.31/x
  3. Step 3: Cross multiply
    114.73x = 172.13 × 78.31
  4. Step 4: Simplify right side
    114.73x = 13,479.32
  5. Step 5: Solve for x
    x = 13,479.32/114.73
  6. Step 6: Final answer
    x = 117.49

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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.