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Finding the Fourth Proportional to 92.90, 139.09 and 67.08

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Solution

The fourth proportional to 92.90, 139.09 and 67.08 is: 100.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.90 : 139.09 = 67.08 : x
  2. Step 2: Convert to fraction form
    92.90/139.09 = 67.08/x
  3. Step 3: Cross multiply
    92.90x = 139.09 × 67.08
  4. Step 4: Simplify right side
    92.90x = 9,330.16
  5. Step 5: Solve for x
    x = 9,330.16/92.90
  6. Step 6: Final answer
    x = 100.44

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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.