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Finding the Fourth Proportional to 1,640.56, 2,460.68 and 614.64

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Solution

The fourth proportional to 1,640.56, 2,460.68 and 614.64 is: 921.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.56 : 2,460.68 = 614.64 : x
  2. Step 2: Convert to fraction form
    1,640.56/2,460.68 = 614.64/x
  3. Step 3: Cross multiply
    1,640.56x = 2,460.68 × 614.64
  4. Step 4: Simplify right side
    1,640.56x = 1,512,432.36
  5. Step 5: Solve for x
    x = 1,512,432.36/1,640.56
  6. Step 6: Final answer
    x = 921.90

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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.