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Finding the Fourth Proportional to 103.70, 142.77 and 90.76

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Solution

The fourth proportional to 103.70, 142.77 and 90.76 is: 124.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.70 : 142.77 = 90.76 : x
  2. Step 2: Convert to fraction form
    103.70/142.77 = 90.76/x
  3. Step 3: Cross multiply
    103.70x = 142.77 × 90.76
  4. Step 4: Simplify right side
    103.70x = 12,957.45
  5. Step 5: Solve for x
    x = 12,957.45/103.70
  6. Step 6: Final answer
    x = 124.95

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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.