Home / 13,140.85-18,133.59-7,474.78

Finding the Fourth Proportional to 13,140.85, 18,133.59 and 7,474.78

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Solution

The fourth proportional to 13,140.85, 18,133.59 and 7,474.78 is: 10,314.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,140.85 : 18,133.59 = 7,474.78 : x
  2. Step 2: Convert to fraction form
    13,140.85/18,133.59 = 7,474.78/x
  3. Step 3: Cross multiply
    13,140.85x = 18,133.59 × 7,474.78
  4. Step 4: Simplify right side
    13,140.85x = 135,544,595.86
  5. Step 5: Solve for x
    x = 135,544,595.86/13,140.85
  6. Step 6: Final answer
    x = 10,314.75

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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.