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Finding the Fourth Proportional to 8,990.57, 12,407.03 and 5,215.96

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Solution

The fourth proportional to 8,990.57, 12,407.03 and 5,215.96 is: 7,198.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,990.57 : 12,407.03 = 5,215.96 : x
  2. Step 2: Convert to fraction form
    8,990.57/12,407.03 = 5,215.96/x
  3. Step 3: Cross multiply
    8,990.57x = 12,407.03 × 5,215.96
  4. Step 4: Simplify right side
    8,990.57x = 64,714,572.20
  5. Step 5: Solve for x
    x = 64,714,572.20/8,990.57
  6. Step 6: Final answer
    x = 7,198.05

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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.