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Finding the Fourth Proportional to 98.67, 135.90 and 87.06

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Solution

The fourth proportional to 98.67, 135.90 and 87.06 is: 119.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.67 : 135.90 = 87.06 : x
  2. Step 2: Convert to fraction form
    98.67/135.90 = 87.06/x
  3. Step 3: Cross multiply
    98.67x = 135.90 × 87.06
  4. Step 4: Simplify right side
    98.67x = 11,831.45
  5. Step 5: Solve for x
    x = 11,831.45/98.67
  6. Step 6: Final answer
    x = 119.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.