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Finding the Fourth Proportional to 5,305.80, 7,321.90 and 2,947.88

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Solution

The fourth proportional to 5,305.80, 7,321.90 and 2,947.88 is: 4,068.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,305.80 : 7,321.90 = 2,947.88 : x
  2. Step 2: Convert to fraction form
    5,305.80/7,321.90 = 2,947.88/x
  3. Step 3: Cross multiply
    5,305.80x = 7,321.90 × 2,947.88
  4. Step 4: Simplify right side
    5,305.80x = 21,584,082.57
  5. Step 5: Solve for x
    x = 21,584,082.57/5,305.80
  6. Step 6: Final answer
    x = 4,068.02

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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.