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Finding the Fourth Proportional to 7,139.80, 9,859.18 and 4,491.80

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Solution

The fourth proportional to 7,139.80, 9,859.18 and 4,491.80 is: 6,202.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,139.80 : 9,859.18 = 4,491.80 : x
  2. Step 2: Convert to fraction form
    7,139.80/9,859.18 = 4,491.80/x
  3. Step 3: Cross multiply
    7,139.80x = 9,859.18 × 4,491.80
  4. Step 4: Simplify right side
    7,139.80x = 44,285,464.72
  5. Step 5: Solve for x
    x = 44,285,464.72/7,139.80
  6. Step 6: Final answer
    x = 6,202.62

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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.