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Finding the Fourth Proportional to 1,209.55, 1,814.46 and 387.85

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Solution

The fourth proportional to 1,209.55, 1,814.46 and 387.85 is: 581.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.55 : 1,814.46 = 387.85 : x
  2. Step 2: Convert to fraction form
    1,209.55/1,814.46 = 387.85/x
  3. Step 3: Cross multiply
    1,209.55x = 1,814.46 × 387.85
  4. Step 4: Simplify right side
    1,209.55x = 703,738.31
  5. Step 5: Solve for x
    x = 703,738.31/1,209.55
  6. Step 6: Final answer
    x = 581.82

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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.