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Finding the Fourth Proportional to 92.32, 127.14 and 78.39

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Solution

The fourth proportional to 92.32, 127.14 and 78.39 is: 107.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.32 : 127.14 = 78.39 : x
  2. Step 2: Convert to fraction form
    92.32/127.14 = 78.39/x
  3. Step 3: Cross multiply
    92.32x = 127.14 × 78.39
  4. Step 4: Simplify right side
    92.32x = 9,966.50
  5. Step 5: Solve for x
    x = 9,966.50/92.32
  6. Step 6: Final answer
    x = 107.96

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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.