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Finding the Fourth Proportional to 165.19, 247.79 and 43.45

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Solution

The fourth proportional to 165.19, 247.79 and 43.45 is: 65.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.19 : 247.79 = 43.45 : x
  2. Step 2: Convert to fraction form
    165.19/247.79 = 43.45/x
  3. Step 3: Cross multiply
    165.19x = 247.79 × 43.45
  4. Step 4: Simplify right side
    165.19x = 10,766.48
  5. Step 5: Solve for x
    x = 10,766.48/165.19
  6. Step 6: Final answer
    x = 65.18

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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.