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Finding the Fourth Proportional to 92.78, 139.15 and 35

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Solution

The fourth proportional to 92.78, 139.15 and 35 is: 52.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.78 : 139.15 = 35 : x
  2. Step 2: Convert to fraction form
    92.78/139.15 = 35/x
  3. Step 3: Cross multiply
    92.78x = 139.15 × 35
  4. Step 4: Simplify right side
    92.78x = 4,870.25
  5. Step 5: Solve for x
    x = 4,870.25/92.78
  6. Step 6: Final answer
    x = 52.49

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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.