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Finding the Fourth Proportional to 6,321.76, 8,726.88 and 4,640.20

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Solution

The fourth proportional to 6,321.76, 8,726.88 and 4,640.20 is: 6,405.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,321.76 : 8,726.88 = 4,640.20 : x
  2. Step 2: Convert to fraction form
    6,321.76/8,726.88 = 4,640.20/x
  3. Step 3: Cross multiply
    6,321.76x = 8,726.88 × 4,640.20
  4. Step 4: Simplify right side
    6,321.76x = 40,494,468.58
  5. Step 5: Solve for x
    x = 40,494,468.58/6,321.76
  6. Step 6: Final answer
    x = 6,405.57

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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.