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Finding the Fourth Proportional to 6,508.76, 8,981.69 and 3,990.87

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Solution

The fourth proportional to 6,508.76, 8,981.69 and 3,990.87 is: 5,507.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,508.76 : 8,981.69 = 3,990.87 : x
  2. Step 2: Convert to fraction form
    6,508.76/8,981.69 = 3,990.87/x
  3. Step 3: Cross multiply
    6,508.76x = 8,981.69 × 3,990.87
  4. Step 4: Simplify right side
    6,508.76x = 35,844,737.22
  5. Step 5: Solve for x
    x = 35,844,737.22/6,508.76
  6. Step 6: Final answer
    x = 5,507.16

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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.