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Finding the Fourth Proportional to 96.12, 143.42 and 85.45

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Solution

The fourth proportional to 96.12, 143.42 and 85.45 is: 127.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.12 : 143.42 = 85.45 : x
  2. Step 2: Convert to fraction form
    96.12/143.42 = 85.45/x
  3. Step 3: Cross multiply
    96.12x = 143.42 × 85.45
  4. Step 4: Simplify right side
    96.12x = 12,255.24
  5. Step 5: Solve for x
    x = 12,255.24/96.12
  6. Step 6: Final answer
    x = 127.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.