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Finding the Fourth Proportional to 103.43, 142.76 and 70.77

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Solution

The fourth proportional to 103.43, 142.76 and 70.77 is: 97.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.43 : 142.76 = 70.77 : x
  2. Step 2: Convert to fraction form
    103.43/142.76 = 70.77/x
  3. Step 3: Cross multiply
    103.43x = 142.76 × 70.77
  4. Step 4: Simplify right side
    103.43x = 10,103.84
  5. Step 5: Solve for x
    x = 10,103.84/103.43
  6. Step 6: Final answer
    x = 97.69

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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.