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Finding the Fourth Proportional to 8,574.60, 12,861.90 and 8,190.60

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Solution

The fourth proportional to 8,574.60, 12,861.90 and 8,190.60 is: 12,285.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,574.60 : 12,861.90 = 8,190.60 : x
  2. Step 2: Convert to fraction form
    8,574.60/12,861.90 = 8,190.60/x
  3. Step 3: Cross multiply
    8,574.60x = 12,861.90 × 8,190.60
  4. Step 4: Simplify right side
    8,574.60x = 105,346,678.14
  5. Step 5: Solve for x
    x = 105,346,678.14/8,574.60
  6. Step 6: Final answer
    x = 12,285.90

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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.