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Finding the Fourth Proportional to 2,812.70, 3,947.50 and 2,812.70

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Solution

The fourth proportional to 2,812.70, 3,947.50 and 2,812.70 is: 3,947.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,812.70 : 3,947.50 = 2,812.70 : x
  2. Step 2: Convert to fraction form
    2,812.70/3,947.50 = 2,812.70/x
  3. Step 3: Cross multiply
    2,812.70x = 3,947.50 × 2,812.70
  4. Step 4: Simplify right side
    2,812.70x = 11,103,133.25
  5. Step 5: Solve for x
    x = 11,103,133.25/2,812.70
  6. Step 6: Final answer
    x = 3,947.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.