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Finding the Fourth Proportional to 92.58, 138.67 and 78.10

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Solution

The fourth proportional to 92.58, 138.67 and 78.10 is: 116.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.58 : 138.67 = 78.10 : x
  2. Step 2: Convert to fraction form
    92.58/138.67 = 78.10/x
  3. Step 3: Cross multiply
    92.58x = 138.67 × 78.10
  4. Step 4: Simplify right side
    92.58x = 10,830.13
  5. Step 5: Solve for x
    x = 10,830.13/92.58
  6. Step 6: Final answer
    x = 116.98

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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.