Home / 13,139.12-18,131.83-7,170.74

Finding the Fourth Proportional to 13,139.12, 18,131.83 and 7,170.74

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Solution

The fourth proportional to 13,139.12, 18,131.83 and 7,170.74 is: 9,895.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.12 : 18,131.83 = 7,170.74 : x
  2. Step 2: Convert to fraction form
    13,139.12/18,131.83 = 7,170.74/x
  3. Step 3: Cross multiply
    13,139.12x = 18,131.83 × 7,170.74
  4. Step 4: Simplify right side
    13,139.12x = 130,018,512.14
  5. Step 5: Solve for x
    x = 130,018,512.14/13,139.12
  6. Step 6: Final answer
    x = 9,895.53

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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.