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Finding the Fourth Proportional to 2,856.78, 4,276.53 and 2,640.78

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Solution

The fourth proportional to 2,856.78, 4,276.53 and 2,640.78 is: 3,953.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,856.78 : 4,276.53 = 2,640.78 : x
  2. Step 2: Convert to fraction form
    2,856.78/4,276.53 = 2,640.78/x
  3. Step 3: Cross multiply
    2,856.78x = 4,276.53 × 2,640.78
  4. Step 4: Simplify right side
    2,856.78x = 11,293,374.89
  5. Step 5: Solve for x
    x = 11,293,374.89/2,856.78
  6. Step 6: Final answer
    x = 3,953.18

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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.