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Finding the Fourth Proportional to 98.81, 148.12 and 84.45

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Solution

The fourth proportional to 98.81, 148.12 and 84.45 is: 126.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.81 : 148.12 = 84.45 : x
  2. Step 2: Convert to fraction form
    98.81/148.12 = 84.45/x
  3. Step 3: Cross multiply
    98.81x = 148.12 × 84.45
  4. Step 4: Simplify right side
    98.81x = 12,509.08
  5. Step 5: Solve for x
    x = 12,509.08/98.81
  6. Step 6: Final answer
    x = 126.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.