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Finding the Fourth Proportional to 74.73, 103.15 and 47.10

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Solution

The fourth proportional to 74.73, 103.15 and 47.10 is: 65.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.73 : 103.15 = 47.10 : x
  2. Step 2: Convert to fraction form
    74.73/103.15 = 47.10/x
  3. Step 3: Cross multiply
    74.73x = 103.15 × 47.10
  4. Step 4: Simplify right side
    74.73x = 4,858.81
  5. Step 5: Solve for x
    x = 4,858.81/74.73
  6. Step 6: Final answer
    x = 65.01

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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.