Home / 13,422.85-18,518.21-7,756.55

Finding the Fourth Proportional to 13,422.85, 18,518.21 and 7,756.55

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Solution

The fourth proportional to 13,422.85, 18,518.21 and 7,756.55 is: 10,700.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,422.85 : 18,518.21 = 7,756.55 : x
  2. Step 2: Convert to fraction form
    13,422.85/18,518.21 = 7,756.55/x
  3. Step 3: Cross multiply
    13,422.85x = 18,518.21 × 7,756.55
  4. Step 4: Simplify right side
    13,422.85x = 143,637,388.93
  5. Step 5: Solve for x
    x = 143,637,388.93/13,422.85
  6. Step 6: Final answer
    x = 10,700.96

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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.