Home / 13,138.88-18,139.02-9,111.56

Finding the Fourth Proportional to 13,138.88, 18,139.02 and 9,111.56

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Solution

The fourth proportional to 13,138.88, 18,139.02 and 9,111.56 is: 12,579.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.88 : 18,139.02 = 9,111.56 : x
  2. Step 2: Convert to fraction form
    13,138.88/18,139.02 = 9,111.56/x
  3. Step 3: Cross multiply
    13,138.88x = 18,139.02 × 9,111.56
  4. Step 4: Simplify right side
    13,138.88x = 165,274,769.07
  5. Step 5: Solve for x
    x = 165,274,769.07/13,138.88
  6. Step 6: Final answer
    x = 12,579.06

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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.