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Finding the Fourth Proportional to 6,420.72, 8,854.66 and 4,928.70

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Solution

The fourth proportional to 6,420.72, 8,854.66 and 4,928.70 is: 6,797.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420.72 : 8,854.66 = 4,928.70 : x
  2. Step 2: Convert to fraction form
    6,420.72/8,854.66 = 4,928.70/x
  3. Step 3: Cross multiply
    6,420.72x = 8,854.66 × 4,928.70
  4. Step 4: Simplify right side
    6,420.72x = 43,641,906.15
  5. Step 5: Solve for x
    x = 43,641,906.15/6,420.72
  6. Step 6: Final answer
    x = 6,797.05

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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.