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Finding the Fourth Proportional to 13,399.91, 18,491.87 and 7,432.49

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Solution

The fourth proportional to 13,399.91, 18,491.87 and 7,432.49 is: 10,256.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,399.91 : 18,491.87 = 7,432.49 : x
  2. Step 2: Convert to fraction form
    13,399.91/18,491.87 = 7,432.49/x
  3. Step 3: Cross multiply
    13,399.91x = 18,491.87 × 7,432.49
  4. Step 4: Simplify right side
    13,399.91x = 137,440,638.86
  5. Step 5: Solve for x
    x = 137,440,638.86/13,399.91
  6. Step 6: Final answer
    x = 10,256.83

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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.