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Finding the Fourth Proportional to 874.59, 1,311.27 and 387.37

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Solution

The fourth proportional to 874.59, 1,311.27 and 387.37 is: 580.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.59 : 1,311.27 = 387.37 : x
  2. Step 2: Convert to fraction form
    874.59/1,311.27 = 387.37/x
  3. Step 3: Cross multiply
    874.59x = 1,311.27 × 387.37
  4. Step 4: Simplify right side
    874.59x = 507,946.66
  5. Step 5: Solve for x
    x = 507,946.66/874.59
  6. Step 6: Final answer
    x = 580.79

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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.