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Finding the Fourth Proportional to 874.37, 1,311.80 and 412.47

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Solution

The fourth proportional to 874.37, 1,311.80 and 412.47 is: 618.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.37 : 1,311.80 = 412.47 : x
  2. Step 2: Convert to fraction form
    874.37/1,311.80 = 412.47/x
  3. Step 3: Cross multiply
    874.37x = 1,311.80 × 412.47
  4. Step 4: Simplify right side
    874.37x = 541,071.59
  5. Step 5: Solve for x
    x = 541,071.59/874.37
  6. Step 6: Final answer
    x = 618.82

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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.