Home / 13,139.70-18,134.45-8,672.74

Finding the Fourth Proportional to 13,139.70, 18,134.45 and 8,672.74

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Solution

The fourth proportional to 13,139.70, 18,134.45 and 8,672.74 is: 11,969.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.70 : 18,134.45 = 8,672.74 : x
  2. Step 2: Convert to fraction form
    13,139.70/18,134.45 = 8,672.74/x
  3. Step 3: Cross multiply
    13,139.70x = 18,134.45 × 8,672.74
  4. Step 4: Simplify right side
    13,139.70x = 157,275,369.89
  5. Step 5: Solve for x
    x = 157,275,369.89/13,139.70
  6. Step 6: Final answer
    x = 11,969.48

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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.