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Finding the Fourth Proportional to 8,431.70, 12,639.02 and 6,955.47

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Solution

The fourth proportional to 8,431.70, 12,639.02 and 6,955.47 is: 10,426.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,431.70 : 12,639.02 = 6,955.47 : x
  2. Step 2: Convert to fraction form
    8,431.70/12,639.02 = 6,955.47/x
  3. Step 3: Cross multiply
    8,431.70x = 12,639.02 × 6,955.47
  4. Step 4: Simplify right side
    8,431.70x = 87,910,289.66
  5. Step 5: Solve for x
    x = 87,910,289.66/8,431.70
  6. Step 6: Final answer
    x = 10,426.17

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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.