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Finding the Fourth Proportional to 1,148.70, 1,722.42 and 455.34

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Solution

The fourth proportional to 1,148.70, 1,722.42 and 455.34 is: 682.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,148.70 : 1,722.42 = 455.34 : x
  2. Step 2: Convert to fraction form
    1,148.70/1,722.42 = 455.34/x
  3. Step 3: Cross multiply
    1,148.70x = 1,722.42 × 455.34
  4. Step 4: Simplify right side
    1,148.70x = 784,286.72
  5. Step 5: Solve for x
    x = 784,286.72/1,148.70
  6. Step 6: Final answer
    x = 682.76

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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.