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Finding the Fourth Proportional to 7,855.68, 10,839.80 and 4,870.43

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Solution

The fourth proportional to 7,855.68, 10,839.80 and 4,870.43 is: 6,720.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,855.68 : 10,839.80 = 4,870.43 : x
  2. Step 2: Convert to fraction form
    7,855.68/10,839.80 = 4,870.43/x
  3. Step 3: Cross multiply
    7,855.68x = 10,839.80 × 4,870.43
  4. Step 4: Simplify right side
    7,855.68x = 52,794,408.56
  5. Step 5: Solve for x
    x = 52,794,408.56/7,855.68
  6. Step 6: Final answer
    x = 6,720.54

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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.