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Finding the Fourth Proportional to 103.12, 142.14 and 85.60

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Solution

The fourth proportional to 103.12, 142.14 and 85.60 is: 117.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.12 : 142.14 = 85.60 : x
  2. Step 2: Convert to fraction form
    103.12/142.14 = 85.60/x
  3. Step 3: Cross multiply
    103.12x = 142.14 × 85.60
  4. Step 4: Simplify right side
    103.12x = 12,167.18
  5. Step 5: Solve for x
    x = 12,167.18/103.12
  6. Step 6: Final answer
    x = 117.99

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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.