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Finding the Fourth Proportional to 8,439.72, 12,660.12 and 3,509.76

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Solution

The fourth proportional to 8,439.72, 12,660.12 and 3,509.76 is: 5,264.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,439.72 : 12,660.12 = 3,509.76 : x
  2. Step 2: Convert to fraction form
    8,439.72/12,660.12 = 3,509.76/x
  3. Step 3: Cross multiply
    8,439.72x = 12,660.12 × 3,509.76
  4. Step 4: Simplify right side
    8,439.72x = 44,433,982.77
  5. Step 5: Solve for x
    x = 44,433,982.77/8,439.72
  6. Step 6: Final answer
    x = 5,264.86

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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.