Home / 12,422.88-18,647.28-9,139.68

Finding the Fourth Proportional to 12,422.88, 18,647.28 and 9,139.68

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Solution

The fourth proportional to 12,422.88, 18,647.28 and 9,139.68 is: 13,719.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,422.88 : 18,647.28 = 9,139.68 : x
  2. Step 2: Convert to fraction form
    12,422.88/18,647.28 = 9,139.68/x
  3. Step 3: Cross multiply
    12,422.88x = 18,647.28 × 9,139.68
  4. Step 4: Simplify right side
    12,422.88x = 170,430,172.07
  5. Step 5: Solve for x
    x = 170,430,172.07/12,422.88
  6. Step 6: Final answer
    x = 13,719.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.