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Finding the Fourth Proportional to 1,440.74, 2,161.49 and 516.39

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Solution

The fourth proportional to 1,440.74, 2,161.49 and 516.39 is: 774.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.74 : 2,161.49 = 516.39 : x
  2. Step 2: Convert to fraction form
    1,440.74/2,161.49 = 516.39/x
  3. Step 3: Cross multiply
    1,440.74x = 2,161.49 × 516.39
  4. Step 4: Simplify right side
    1,440.74x = 1,116,171.82
  5. Step 5: Solve for x
    x = 1,116,171.82/1,440.74
  6. Step 6: Final answer
    x = 774.72

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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.