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Finding the Fourth Proportional to 98.84, 147.67 and 81.52

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Solution

The fourth proportional to 98.84, 147.67 and 81.52 is: 121.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.84 : 147.67 = 81.52 : x
  2. Step 2: Convert to fraction form
    98.84/147.67 = 81.52/x
  3. Step 3: Cross multiply
    98.84x = 147.67 × 81.52
  4. Step 4: Simplify right side
    98.84x = 12,038.06
  5. Step 5: Solve for x
    x = 12,038.06/98.84
  6. Step 6: Final answer
    x = 121.79

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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.