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Finding the Fourth Proportional to 1,105.70, 1,658.78 and 412.37

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Solution

The fourth proportional to 1,105.70, 1,658.78 and 412.37 is: 618.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.70 : 1,658.78 = 412.37 : x
  2. Step 2: Convert to fraction form
    1,105.70/1,658.78 = 412.37/x
  3. Step 3: Cross multiply
    1,105.70x = 1,658.78 × 412.37
  4. Step 4: Simplify right side
    1,105.70x = 684,031.11
  5. Step 5: Solve for x
    x = 684,031.11/1,105.70
  6. Step 6: Final answer
    x = 618.64

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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.