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Finding the Fourth Proportional to 5,139.40, 7,709.10 and 4,361.80

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Solution

The fourth proportional to 5,139.40, 7,709.10 and 4,361.80 is: 6,542.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,139.40 : 7,709.10 = 4,361.80 : x
  2. Step 2: Convert to fraction form
    5,139.40/7,709.10 = 4,361.80/x
  3. Step 3: Cross multiply
    5,139.40x = 7,709.10 × 4,361.80
  4. Step 4: Simplify right side
    5,139.40x = 33,625,552.38
  5. Step 5: Solve for x
    x = 33,625,552.38/5,139.40
  6. Step 6: Final answer
    x = 6,542.70

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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.