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Finding the Fourth Proportional to 74.58, 103.05 and 61.62

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Solution

The fourth proportional to 74.58, 103.05 and 61.62 is: 85.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.58 : 103.05 = 61.62 : x
  2. Step 2: Convert to fraction form
    74.58/103.05 = 61.62/x
  3. Step 3: Cross multiply
    74.58x = 103.05 × 61.62
  4. Step 4: Simplify right side
    74.58x = 6,349.94
  5. Step 5: Solve for x
    x = 6,349.94/74.58
  6. Step 6: Final answer
    x = 85.14

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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.