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Finding the Fourth Proportional to 74.99, 103.40 and 63.31

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Solution

The fourth proportional to 74.99, 103.40 and 63.31 is: 87.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.99 : 103.40 = 63.31 : x
  2. Step 2: Convert to fraction form
    74.99/103.40 = 63.31/x
  3. Step 3: Cross multiply
    74.99x = 103.40 × 63.31
  4. Step 4: Simplify right side
    74.99x = 6,546.20
  5. Step 5: Solve for x
    x = 6,546.20/74.99
  6. Step 6: Final answer
    x = 87.29

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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.