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Finding the Fourth Proportional to 6,387.80, 9,581.70 and 4,314.20

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Solution

The fourth proportional to 6,387.80, 9,581.70 and 4,314.20 is: 6,471.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,387.80 : 9,581.70 = 4,314.20 : x
  2. Step 2: Convert to fraction form
    6,387.80/9,581.70 = 4,314.20/x
  3. Step 3: Cross multiply
    6,387.80x = 9,581.70 × 4,314.20
  4. Step 4: Simplify right side
    6,387.80x = 41,337,370.14
  5. Step 5: Solve for x
    x = 41,337,370.14/6,387.80
  6. Step 6: Final answer
    x = 6,471.30

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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.