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Finding the Fourth Proportional to 103.35, 142.62 and 61.88

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Solution

The fourth proportional to 103.35, 142.62 and 61.88 is: 85.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.35 : 142.62 = 61.88 : x
  2. Step 2: Convert to fraction form
    103.35/142.62 = 61.88/x
  3. Step 3: Cross multiply
    103.35x = 142.62 × 61.88
  4. Step 4: Simplify right side
    103.35x = 8,824.61
  5. Step 5: Solve for x
    x = 8,824.61/103.35
  6. Step 6: Final answer
    x = 85.39

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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.