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Finding the Fourth Proportional to 99.84, 136.48 and 98.40

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Solution

The fourth proportional to 99.84, 136.48 and 98.40 is: 134.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.84 : 136.48 = 98.40 : x
  2. Step 2: Convert to fraction form
    99.84/136.48 = 98.40/x
  3. Step 3: Cross multiply
    99.84x = 136.48 × 98.40
  4. Step 4: Simplify right side
    99.84x = 13,429.63
  5. Step 5: Solve for x
    x = 13,429.63/99.84
  6. Step 6: Final answer
    x = 134.51

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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.