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Finding the Fourth Proportional to 92.56, 138.90 and 70.90

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Solution

The fourth proportional to 92.56, 138.90 and 70.90 is: 106.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.56 : 138.90 = 70.90 : x
  2. Step 2: Convert to fraction form
    92.56/138.90 = 70.90/x
  3. Step 3: Cross multiply
    92.56x = 138.90 × 70.90
  4. Step 4: Simplify right side
    92.56x = 9,848.01
  5. Step 5: Solve for x
    x = 9,848.01/92.56
  6. Step 6: Final answer
    x = 106.40

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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.