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Finding the Fourth Proportional to 98.19, 135.45 and 87.30

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Solution

The fourth proportional to 98.19, 135.45 and 87.30 is: 120.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.19 : 135.45 = 87.30 : x
  2. Step 2: Convert to fraction form
    98.19/135.45 = 87.30/x
  3. Step 3: Cross multiply
    98.19x = 135.45 × 87.30
  4. Step 4: Simplify right side
    98.19x = 11,824.79
  5. Step 5: Solve for x
    x = 11,824.79/98.19
  6. Step 6: Final answer
    x = 120.43

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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.