Home / 13,139.20-18,133.76-8,672.24

Finding the Fourth Proportional to 13,139.20, 18,133.76 and 8,672.24

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Solution

The fourth proportional to 13,139.20, 18,133.76 and 8,672.24 is: 11,968.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.20 : 18,133.76 = 8,672.24 : x
  2. Step 2: Convert to fraction form
    13,139.20/18,133.76 = 8,672.24/x
  3. Step 3: Cross multiply
    13,139.20x = 18,133.76 × 8,672.24
  4. Step 4: Simplify right side
    13,139.20x = 157,260,275.46
  5. Step 5: Solve for x
    x = 157,260,275.46/13,139.20
  6. Step 6: Final answer
    x = 11,968.79

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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.