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Finding the Fourth Proportional to 1,381.77, 2,072.85 and 516

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Solution

The fourth proportional to 1,381.77, 2,072.85 and 516 is: 774.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.77 : 2,072.85 = 516 : x
  2. Step 2: Convert to fraction form
    1,381.77/2,072.85 = 516/x
  3. Step 3: Cross multiply
    1,381.77x = 2,072.85 × 516
  4. Step 4: Simplify right side
    1,381.77x = 1,069,590.60
  5. Step 5: Solve for x
    x = 1,069,590.60/1,381.77
  6. Step 6: Final answer
    x = 774.07

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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.