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Finding the Fourth Proportional to 1,440.39, 2,161.57 and 892.88

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Solution

The fourth proportional to 1,440.39, 2,161.57 and 892.88 is: 1,339.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.39 : 2,161.57 = 892.88 : x
  2. Step 2: Convert to fraction form
    1,440.39/2,161.57 = 892.88/x
  3. Step 3: Cross multiply
    1,440.39x = 2,161.57 × 892.88
  4. Step 4: Simplify right side
    1,440.39x = 1,930,019.36
  5. Step 5: Solve for x
    x = 1,930,019.36/1,440.39
  6. Step 6: Final answer
    x = 1,339.93

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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.