Home / 13,690.24-18,891.36-7,720.72

Finding the Fourth Proportional to 13,690.24, 18,891.36 and 7,720.72

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Solution

The fourth proportional to 13,690.24, 18,891.36 and 7,720.72 is: 10,653.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.24 : 18,891.36 = 7,720.72 : x
  2. Step 2: Convert to fraction form
    13,690.24/18,891.36 = 7,720.72/x
  3. Step 3: Cross multiply
    13,690.24x = 18,891.36 × 7,720.72
  4. Step 4: Simplify right side
    13,690.24x = 145,854,900.98
  5. Step 5: Solve for x
    x = 145,854,900.98/13,690.24
  6. Step 6: Final answer
    x = 10,653.93

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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.