Home / 13,139.85-18,132.21-7,473.78

Finding the Fourth Proportional to 13,139.85, 18,132.21 and 7,473.78

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Solution

The fourth proportional to 13,139.85, 18,132.21 and 7,473.78 is: 10,313.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.85 : 18,132.21 = 7,473.78 : x
  2. Step 2: Convert to fraction form
    13,139.85/18,132.21 = 7,473.78/x
  3. Step 3: Cross multiply
    13,139.85x = 18,132.21 × 7,473.78
  4. Step 4: Simplify right side
    13,139.85x = 135,516,148.45
  5. Step 5: Solve for x
    x = 135,516,148.45/13,139.85
  6. Step 6: Final answer
    x = 10,313.37

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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.