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Finding the Fourth Proportional to 103.68, 142.80 and 86.04

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Solution

The fourth proportional to 103.68, 142.80 and 86.04 is: 118.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.68 : 142.80 = 86.04 : x
  2. Step 2: Convert to fraction form
    103.68/142.80 = 86.04/x
  3. Step 3: Cross multiply
    103.68x = 142.80 × 86.04
  4. Step 4: Simplify right side
    103.68x = 12,286.51
  5. Step 5: Solve for x
    x = 12,286.51/103.68
  6. Step 6: Final answer
    x = 118.50

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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.