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Finding the Fourth Proportional to 6,490.40, 9,713.20 and 3,895.20

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Solution

The fourth proportional to 6,490.40, 9,713.20 and 3,895.20 is: 5,829.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,490.40 : 9,713.20 = 3,895.20 : x
  2. Step 2: Convert to fraction form
    6,490.40/9,713.20 = 3,895.20/x
  3. Step 3: Cross multiply
    6,490.40x = 9,713.20 × 3,895.20
  4. Step 4: Simplify right side
    6,490.40x = 37,834,856.64
  5. Step 5: Solve for x
    x = 37,834,856.64/6,490.40
  6. Step 6: Final answer
    x = 5,829.36

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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.