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Finding the Fourth Proportional to 2,640.90, 3,644.76 and 1,521.90

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Solution

The fourth proportional to 2,640.90, 3,644.76 and 1,521.90 is: 2,100.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.90 : 3,644.76 = 1,521.90 : x
  2. Step 2: Convert to fraction form
    2,640.90/3,644.76 = 1,521.90/x
  3. Step 3: Cross multiply
    2,640.90x = 3,644.76 × 1,521.90
  4. Step 4: Simplify right side
    2,640.90x = 5,546,960.24
  5. Step 5: Solve for x
    x = 5,546,960.24/2,640.90
  6. Step 6: Final answer
    x = 2,100.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.