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Finding the Fourth Proportional to 208.85, 312.92 and 93.12

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Solution

The fourth proportional to 208.85, 312.92 and 93.12 is: 139.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.85 : 312.92 = 93.12 : x
  2. Step 2: Convert to fraction form
    208.85/312.92 = 93.12/x
  3. Step 3: Cross multiply
    208.85x = 312.92 × 93.12
  4. Step 4: Simplify right side
    208.85x = 29,139.11
  5. Step 5: Solve for x
    x = 29,139.11/208.85
  6. Step 6: Final answer
    x = 139.52

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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.