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Finding the Fourth Proportional to 98.18, 146.64 and 90.14

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Solution

The fourth proportional to 98.18, 146.64 and 90.14 is: 134.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.18 : 146.64 = 90.14 : x
  2. Step 2: Convert to fraction form
    98.18/146.64 = 90.14/x
  3. Step 3: Cross multiply
    98.18x = 146.64 × 90.14
  4. Step 4: Simplify right side
    98.18x = 13,218.13
  5. Step 5: Solve for x
    x = 13,218.13/98.18
  6. Step 6: Final answer
    x = 134.63

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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.