Home / 13,391.22-19,945.38-12,688.68

Finding the Fourth Proportional to 13,391.22, 19,945.38 and 12,688.68

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Solution

The fourth proportional to 13,391.22, 19,945.38 and 12,688.68 is: 18,898.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,391.22 : 19,945.38 = 12,688.68 : x
  2. Step 2: Convert to fraction form
    13,391.22/19,945.38 = 12,688.68/x
  3. Step 3: Cross multiply
    13,391.22x = 19,945.38 × 12,688.68
  4. Step 4: Simplify right side
    13,391.22x = 253,080,544.30
  5. Step 5: Solve for x
    x = 253,080,544.30/13,391.22
  6. Step 6: Final answer
    x = 18,898.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.