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Finding the Fourth Proportional to 103.68, 143.09 and 88.11

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Solution

The fourth proportional to 103.68, 143.09 and 88.11 is: 121.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.68 : 143.09 = 88.11 : x
  2. Step 2: Convert to fraction form
    103.68/143.09 = 88.11/x
  3. Step 3: Cross multiply
    103.68x = 143.09 × 88.11
  4. Step 4: Simplify right side
    103.68x = 12,607.22
  5. Step 5: Solve for x
    x = 12,607.22/103.68
  6. Step 6: Final answer
    x = 121.60

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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.