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Finding the Fourth Proportional to 6,490.21, 8,945.97 and 5,071.42

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Solution

The fourth proportional to 6,490.21, 8,945.97 and 5,071.42 is: 6,990.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,490.21 : 8,945.97 = 5,071.42 : x
  2. Step 2: Convert to fraction form
    6,490.21/8,945.97 = 5,071.42/x
  3. Step 3: Cross multiply
    6,490.21x = 8,945.97 × 5,071.42
  4. Step 4: Simplify right side
    6,490.21x = 45,368,771.18
  5. Step 5: Solve for x
    x = 45,368,771.18/6,490.21
  6. Step 6: Final answer
    x = 6,990.34

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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.