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Finding the Fourth Proportional to 98.84, 147.55 and 84.30

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Solution

The fourth proportional to 98.84, 147.55 and 84.30 is: 125.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.84 : 147.55 = 84.30 : x
  2. Step 2: Convert to fraction form
    98.84/147.55 = 84.30/x
  3. Step 3: Cross multiply
    98.84x = 147.55 × 84.30
  4. Step 4: Simplify right side
    98.84x = 12,438.47
  5. Step 5: Solve for x
    x = 12,438.47/98.84
  6. Step 6: Final answer
    x = 125.84

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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.