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Finding the Fourth Proportional to 165.45, 248.10 and 74.10

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Solution

The fourth proportional to 165.45, 248.10 and 74.10 is: 111.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.45 : 248.10 = 74.10 : x
  2. Step 2: Convert to fraction form
    165.45/248.10 = 74.10/x
  3. Step 3: Cross multiply
    165.45x = 248.10 × 74.10
  4. Step 4: Simplify right side
    165.45x = 18,384.21
  5. Step 5: Solve for x
    x = 18,384.21/165.45
  6. Step 6: Final answer
    x = 111.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.