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Finding the Fourth Proportional to 103.71, 143.19 and 85.35

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Solution

The fourth proportional to 103.71, 143.19 and 85.35 is: 117.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.71 : 143.19 = 85.35 : x
  2. Step 2: Convert to fraction form
    103.71/143.19 = 85.35/x
  3. Step 3: Cross multiply
    103.71x = 143.19 × 85.35
  4. Step 4: Simplify right side
    103.71x = 12,221.27
  5. Step 5: Solve for x
    x = 12,221.27/103.71
  6. Step 6: Final answer
    x = 117.84

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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.