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Finding the Fourth Proportional to 98.84, 135.80 and 89.40

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Solution

The fourth proportional to 98.84, 135.80 and 89.40 is: 122.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.84 : 135.80 = 89.40 : x
  2. Step 2: Convert to fraction form
    98.84/135.80 = 89.40/x
  3. Step 3: Cross multiply
    98.84x = 135.80 × 89.40
  4. Step 4: Simplify right side
    98.84x = 12,140.52
  5. Step 5: Solve for x
    x = 12,140.52/98.84
  6. Step 6: Final answer
    x = 122.83

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.