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Finding the Fourth Proportional to 74.74, 103.18 and 61.66

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Solution

The fourth proportional to 74.74, 103.18 and 61.66 is: 85.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.74 : 103.18 = 61.66 : x
  2. Step 2: Convert to fraction form
    74.74/103.18 = 61.66/x
  3. Step 3: Cross multiply
    74.74x = 103.18 × 61.66
  4. Step 4: Simplify right side
    74.74x = 6,362.08
  5. Step 5: Solve for x
    x = 6,362.08/74.74
  6. Step 6: Final answer
    x = 85.12

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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.