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Finding the Fourth Proportional to 8,541.80, 12,812.70 and 8,412.20

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Solution

The fourth proportional to 8,541.80, 12,812.70 and 8,412.20 is: 12,618.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,541.80 : 12,812.70 = 8,412.20 : x
  2. Step 2: Convert to fraction form
    8,541.80/12,812.70 = 8,412.20/x
  3. Step 3: Cross multiply
    8,541.80x = 12,812.70 × 8,412.20
  4. Step 4: Simplify right side
    8,541.80x = 107,782,994.94
  5. Step 5: Solve for x
    x = 107,782,994.94/8,541.80
  6. Step 6: Final answer
    x = 12,618.30

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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.