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Finding the Fourth Proportional to 2,640.68, 3,960.72 and 666.30

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Solution

The fourth proportional to 2,640.68, 3,960.72 and 666.30 is: 999.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.68 : 3,960.72 = 666.30 : x
  2. Step 2: Convert to fraction form
    2,640.68/3,960.72 = 666.30/x
  3. Step 3: Cross multiply
    2,640.68x = 3,960.72 × 666.30
  4. Step 4: Simplify right side
    2,640.68x = 2,639,027.74
  5. Step 5: Solve for x
    x = 2,639,027.74/2,640.68
  6. Step 6: Final answer
    x = 999.38

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1.5x scale

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.