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Finding the Fourth Proportional to 102.96, 141.96 and 99.60

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Solution

The fourth proportional to 102.96, 141.96 and 99.60 is: 137.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.96 : 141.96 = 99.60 : x
  2. Step 2: Convert to fraction form
    102.96/141.96 = 99.60/x
  3. Step 3: Cross multiply
    102.96x = 141.96 × 99.60
  4. Step 4: Simplify right side
    102.96x = 14,139.22
  5. Step 5: Solve for x
    x = 14,139.22/102.96
  6. Step 6: Final answer
    x = 137.33

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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.