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Finding the Fourth Proportional to 6,491.80, 9,726.90 and 5,390.20

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Solution

The fourth proportional to 6,491.80, 9,726.90 and 5,390.20 is: 8,076.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,491.80 : 9,726.90 = 5,390.20 : x
  2. Step 2: Convert to fraction form
    6,491.80/9,726.90 = 5,390.20/x
  3. Step 3: Cross multiply
    6,491.80x = 9,726.90 × 5,390.20
  4. Step 4: Simplify right side
    6,491.80x = 52,429,936.38
  5. Step 5: Solve for x
    x = 52,429,936.38/6,491.80
  6. Step 6: Final answer
    x = 8,076.33

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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.