Home / 13,139.80-18,133.35-7,474.40

Finding the Fourth Proportional to 13,139.80, 18,133.35 and 7,474.40

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Solution

The fourth proportional to 13,139.80, 18,133.35 and 7,474.40 is: 10,314.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.80 : 18,133.35 = 7,474.40 : x
  2. Step 2: Convert to fraction form
    13,139.80/18,133.35 = 7,474.40/x
  3. Step 3: Cross multiply
    13,139.80x = 18,133.35 × 7,474.40
  4. Step 4: Simplify right side
    13,139.80x = 135,535,873.87
  5. Step 5: Solve for x
    x = 135,535,873.87/13,139.80
  6. Step 6: Final answer
    x = 10,314.91

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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.