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Finding the Fourth Proportional to 103.05, 141.71 and 91.41

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Solution

The fourth proportional to 103.05, 141.71 and 91.41 is: 125.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.05 : 141.71 = 91.41 : x
  2. Step 2: Convert to fraction form
    103.05/141.71 = 91.41/x
  3. Step 3: Cross multiply
    103.05x = 141.71 × 91.41
  4. Step 4: Simplify right side
    103.05x = 12,953.71
  5. Step 5: Solve for x
    x = 12,953.71/103.05
  6. Step 6: Final answer
    x = 125.70

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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.