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Finding the Fourth Proportional to 1,440.75, 2,161.17 and 400.74

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Solution

The fourth proportional to 1,440.75, 2,161.17 and 400.74 is: 601.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.75 : 2,161.17 = 400.74 : x
  2. Step 2: Convert to fraction form
    1,440.75/2,161.17 = 400.74/x
  3. Step 3: Cross multiply
    1,440.75x = 2,161.17 × 400.74
  4. Step 4: Simplify right side
    1,440.75x = 866,067.27
  5. Step 5: Solve for x
    x = 866,067.27/1,440.75
  6. Step 6: Final answer
    x = 601.12

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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.