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Finding the Fourth Proportional to 6,491.69, 8,955.60 and 3,972.80

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Solution

The fourth proportional to 6,491.69, 8,955.60 and 3,972.80 is: 5,480.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,491.69 : 8,955.60 = 3,972.80 : x
  2. Step 2: Convert to fraction form
    6,491.69/8,955.60 = 3,972.80/x
  3. Step 3: Cross multiply
    6,491.69x = 8,955.60 × 3,972.80
  4. Step 4: Simplify right side
    6,491.69x = 35,578,772.83
  5. Step 5: Solve for x
    x = 35,578,772.83/6,491.69
  6. Step 6: Final answer
    x = 5,480.66

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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.