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Finding the Fourth Proportional to 8,579.70, 12,847.95 and 5,642.10

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Solution

The fourth proportional to 8,579.70, 12,847.95 and 5,642.10 is: 8,448.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,579.70 : 12,847.95 = 5,642.10 : x
  2. Step 2: Convert to fraction form
    8,579.70/12,847.95 = 5,642.10/x
  3. Step 3: Cross multiply
    8,579.70x = 12,847.95 × 5,642.10
  4. Step 4: Simplify right side
    8,579.70x = 72,489,418.70
  5. Step 5: Solve for x
    x = 72,489,418.70/8,579.70
  6. Step 6: Final answer
    x = 8,448.95

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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.