Home / 12,690.88-17,513.40-7,389.22

Finding the Fourth Proportional to 12,690.88, 17,513.40 and 7,389.22

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Solution

The fourth proportional to 12,690.88, 17,513.40 and 7,389.22 is: 10,197.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690.88 : 17,513.40 = 7,389.22 : x
  2. Step 2: Convert to fraction form
    12,690.88/17,513.40 = 7,389.22/x
  3. Step 3: Cross multiply
    12,690.88x = 17,513.40 × 7,389.22
  4. Step 4: Simplify right side
    12,690.88x = 129,410,365.55
  5. Step 5: Solve for x
    x = 129,410,365.55/12,690.88
  6. Step 6: Final answer
    x = 10,197.12

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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.