Home / 13,151.21-18,140.90-9,111.74

Finding the Fourth Proportional to 13,151.21, 18,140.90 and 9,111.74

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Solution

The fourth proportional to 13,151.21, 18,140.90 and 9,111.74 is: 12,568.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,151.21 : 18,140.90 = 9,111.74 : x
  2. Step 2: Convert to fraction form
    13,151.21/18,140.90 = 9,111.74/x
  3. Step 3: Cross multiply
    13,151.21x = 18,140.90 × 9,111.74
  4. Step 4: Simplify right side
    13,151.21x = 165,295,027.90
  5. Step 5: Solve for x
    x = 165,295,027.90/13,151.21
  6. Step 6: Final answer
    x = 12,568.81

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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.