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Finding the Fourth Proportional to 873.87, 1,311.26 and 387.27

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Solution

The fourth proportional to 873.87, 1,311.26 and 387.27 is: 581.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.87 : 1,311.26 = 387.27 : x
  2. Step 2: Convert to fraction form
    873.87/1,311.26 = 387.27/x
  3. Step 3: Cross multiply
    873.87x = 1,311.26 × 387.27
  4. Step 4: Simplify right side
    873.87x = 507,811.66
  5. Step 5: Solve for x
    x = 507,811.66/873.87
  6. Step 6: Final answer
    x = 581.11

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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.