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Finding the Fourth Proportional to 112.30, 168.08 and 85.10

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Solution

The fourth proportional to 112.30, 168.08 and 85.10 is: 127.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.30 : 168.08 = 85.10 : x
  2. Step 2: Convert to fraction form
    112.30/168.08 = 85.10/x
  3. Step 3: Cross multiply
    112.30x = 168.08 × 85.10
  4. Step 4: Simplify right side
    112.30x = 14,302.34
  5. Step 5: Solve for x
    x = 14,302.34/112.30
  6. Step 6: Final answer
    x = 127.36

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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.