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Finding the Fourth Proportional to 6,490.21, 8,957.18 and 3,974.01

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Solution

The fourth proportional to 6,490.21, 8,957.18 and 3,974.01 is: 5,484.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,490.21 : 8,957.18 = 3,974.01 : x
  2. Step 2: Convert to fraction form
    6,490.21/8,957.18 = 3,974.01/x
  3. Step 3: Cross multiply
    6,490.21x = 8,957.18 × 3,974.01
  4. Step 4: Simplify right side
    6,490.21x = 35,595,932.83
  5. Step 5: Solve for x
    x = 35,595,932.83/6,490.21
  6. Step 6: Final answer
    x = 5,484.56

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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.