Home / 13,640.24-18,822.20-7,671.78

Finding the Fourth Proportional to 13,640.24, 18,822.20 and 7,671.78

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Solution

The fourth proportional to 13,640.24, 18,822.20 and 7,671.78 is: 10,586.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,640.24 : 18,822.20 = 7,671.78 : x
  2. Step 2: Convert to fraction form
    13,640.24/18,822.20 = 7,671.78/x
  3. Step 3: Cross multiply
    13,640.24x = 18,822.20 × 7,671.78
  4. Step 4: Simplify right side
    13,640.24x = 144,399,777.52
  5. Step 5: Solve for x
    x = 144,399,777.52/13,640.24
  6. Step 6: Final answer
    x = 10,586.31

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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.