Home / 12,422.80-18,605.40-7,757.20

Finding the Fourth Proportional to 12,422.80, 18,605.40 and 7,757.20

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Solution

The fourth proportional to 12,422.80, 18,605.40 and 7,757.20 is: 11,617.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,422.80 : 18,605.40 = 7,757.20 : x
  2. Step 2: Convert to fraction form
    12,422.80/18,605.40 = 7,757.20/x
  3. Step 3: Cross multiply
    12,422.80x = 18,605.40 × 7,757.20
  4. Step 4: Simplify right side
    12,422.80x = 144,325,808.88
  5. Step 5: Solve for x
    x = 144,325,808.88/12,422.80
  6. Step 6: Final answer
    x = 11,617.82

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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.