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Finding the Fourth Proportional to 8,439.43, 11,650.05 and 7,908.11

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Solution

The fourth proportional to 8,439.43, 11,650.05 and 7,908.11 is: 10,916.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,439.43 : 11,650.05 = 7,908.11 : x
  2. Step 2: Convert to fraction form
    8,439.43/11,650.05 = 7,908.11/x
  3. Step 3: Cross multiply
    8,439.43x = 11,650.05 × 7,908.11
  4. Step 4: Simplify right side
    8,439.43x = 92,129,875.50
  5. Step 5: Solve for x
    x = 92,129,875.50/8,439.43
  6. Step 6: Final answer
    x = 10,916.60

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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.