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Finding the Fourth Proportional to 99.84, 148.98 and 84.69

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Solution

The fourth proportional to 99.84, 148.98 and 84.69 is: 126.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.84 : 148.98 = 84.69 : x
  2. Step 2: Convert to fraction form
    99.84/148.98 = 84.69/x
  3. Step 3: Cross multiply
    99.84x = 148.98 × 84.69
  4. Step 4: Simplify right side
    99.84x = 12,617.12
  5. Step 5: Solve for x
    x = 12,617.12/99.84
  6. Step 6: Final answer
    x = 126.37

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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.