Home / 13,139.21-18,132.08-8,423.49

Finding the Fourth Proportional to 13,139.21, 18,132.08 and 8,423.49

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Solution

The fourth proportional to 13,139.21, 18,132.08 and 8,423.49 is: 11,624.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.21 : 18,132.08 = 8,423.49 : x
  2. Step 2: Convert to fraction form
    13,139.21/18,132.08 = 8,423.49/x
  3. Step 3: Cross multiply
    13,139.21x = 18,132.08 × 8,423.49
  4. Step 4: Simplify right side
    13,139.21x = 152,735,394.56
  5. Step 5: Solve for x
    x = 152,735,394.56/13,139.21
  6. Step 6: Final answer
    x = 11,624.40

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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.