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Finding the Fourth Proportional to 8,570.80, 12,855.33 and 5,815.18

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Solution

The fourth proportional to 8,570.80, 12,855.33 and 5,815.18 is: 8,722.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,570.80 : 12,855.33 = 5,815.18 : x
  2. Step 2: Convert to fraction form
    8,570.80/12,855.33 = 5,815.18/x
  3. Step 3: Cross multiply
    8,570.80x = 12,855.33 × 5,815.18
  4. Step 4: Simplify right side
    8,570.80x = 74,756,057.91
  5. Step 5: Solve for x
    x = 74,756,057.91/8,570.80
  6. Step 6: Final answer
    x = 8,722.18

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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.