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Finding the Fourth Proportional to 104.25, 143.88 and 99.64

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Solution

The fourth proportional to 104.25, 143.88 and 99.64 is: 137.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.25 : 143.88 = 99.64 : x
  2. Step 2: Convert to fraction form
    104.25/143.88 = 99.64/x
  3. Step 3: Cross multiply
    104.25x = 143.88 × 99.64
  4. Step 4: Simplify right side
    104.25x = 14,335.76
  5. Step 5: Solve for x
    x = 14,335.76/104.25
  6. Step 6: Final answer
    x = 137.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.