Home / 12,639.40-17,439.78-9,649.96

Finding the Fourth Proportional to 12,639.40, 17,439.78 and 9,649.96

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Solution

The fourth proportional to 12,639.40, 17,439.78 and 9,649.96 is: 13,314.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.40 : 17,439.78 = 9,649.96 : x
  2. Step 2: Convert to fraction form
    12,639.40/17,439.78 = 9,649.96/x
  3. Step 3: Cross multiply
    12,639.40x = 17,439.78 × 9,649.96
  4. Step 4: Simplify right side
    12,639.40x = 168,293,179.41
  5. Step 5: Solve for x
    x = 168,293,179.41/12,639.40
  6. Step 6: Final answer
    x = 13,314.97

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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.