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Finding the Fourth Proportional to 8,639.62, 12,930.24 and 5,355.48

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Solution

The fourth proportional to 8,639.62, 12,930.24 and 5,355.48 is: 8,015.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,639.62 : 12,930.24 = 5,355.48 : x
  2. Step 2: Convert to fraction form
    8,639.62/12,930.24 = 5,355.48/x
  3. Step 3: Cross multiply
    8,639.62x = 12,930.24 × 5,355.48
  4. Step 4: Simplify right side
    8,639.62x = 69,247,641.72
  5. Step 5: Solve for x
    x = 69,247,641.72/8,639.62
  6. Step 6: Final answer
    x = 8,015.13

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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.