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Finding the Fourth Proportional to 3,720.76, 5,134.62 and 2,149.72

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Solution

The fourth proportional to 3,720.76, 5,134.62 and 2,149.72 is: 2,966.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,720.76 : 5,134.62 = 2,149.72 : x
  2. Step 2: Convert to fraction form
    3,720.76/5,134.62 = 2,149.72/x
  3. Step 3: Cross multiply
    3,720.76x = 5,134.62 × 2,149.72
  4. Step 4: Simplify right side
    3,720.76x = 11,037,995.31
  5. Step 5: Solve for x
    x = 11,037,995.31/3,720.76
  6. Step 6: Final answer
    x = 2,966.60

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Half scale
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Double scale
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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.