Home / 13,422.49-18,516.96-8,640.72

Finding the Fourth Proportional to 13,422.49, 18,516.96 and 8,640.72

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Solution

The fourth proportional to 13,422.49, 18,516.96 and 8,640.72 is: 11,920.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,422.49 : 18,516.96 = 8,640.72 : x
  2. Step 2: Convert to fraction form
    13,422.49/18,516.96 = 8,640.72/x
  3. Step 3: Cross multiply
    13,422.49x = 18,516.96 × 8,640.72
  4. Step 4: Simplify right side
    13,422.49x = 159,999,764.77
  5. Step 5: Solve for x
    x = 159,999,764.77/13,422.49
  6. Step 6: Final answer
    x = 11,920.28

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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.