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Finding the Fourth Proportional to 98.02, 146.90 and 87.68

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Solution

The fourth proportional to 98.02, 146.90 and 87.68 is: 131.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.02 : 146.90 = 87.68 : x
  2. Step 2: Convert to fraction form
    98.02/146.90 = 87.68/x
  3. Step 3: Cross multiply
    98.02x = 146.90 × 87.68
  4. Step 4: Simplify right side
    98.02x = 12,879.46
  5. Step 5: Solve for x
    x = 12,879.46/98.02
  6. Step 6: Final answer
    x = 131.40

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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.