Home / 11,117.90-16,640.40-8,639.30

Finding the Fourth Proportional to 11,117.90, 16,640.40 and 8,639.30

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Solution

The fourth proportional to 11,117.90, 16,640.40 and 8,639.30 is: 12,930.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,117.90 : 16,640.40 = 8,639.30 : x
  2. Step 2: Convert to fraction form
    11,117.90/16,640.40 = 8,639.30/x
  3. Step 3: Cross multiply
    11,117.90x = 16,640.40 × 8,639.30
  4. Step 4: Simplify right side
    11,117.90x = 143,761,407.72
  5. Step 5: Solve for x
    x = 143,761,407.72/11,117.90
  6. Step 6: Final answer
    x = 12,930.63

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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.