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Finding the Fourth Proportional to 1,440.91, 2,161.30 and 400.91

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Solution

The fourth proportional to 1,440.91, 2,161.30 and 400.91 is: 601.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.91 : 2,161.30 = 400.91 : x
  2. Step 2: Convert to fraction form
    1,440.91/2,161.30 = 400.91/x
  3. Step 3: Cross multiply
    1,440.91x = 2,161.30 × 400.91
  4. Step 4: Simplify right side
    1,440.91x = 866,486.78
  5. Step 5: Solve for x
    x = 866,486.78/1,440.91
  6. Step 6: Final answer
    x = 601.35

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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.