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Finding the Fourth Proportional to 98.12, 146.36 and 85.40

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Solution

The fourth proportional to 98.12, 146.36 and 85.40 is: 127.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.12 : 146.36 = 85.40 : x
  2. Step 2: Convert to fraction form
    98.12/146.36 = 85.40/x
  3. Step 3: Cross multiply
    98.12x = 146.36 × 85.40
  4. Step 4: Simplify right side
    98.12x = 12,499.14
  5. Step 5: Solve for x
    x = 12,499.14/98.12
  6. Step 6: Final answer
    x = 127.39

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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.