Home / 19,418.80-29,128.12-7,729.28

Finding the Fourth Proportional to 19,418.80, 29,128.12 and 7,729.28

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Solution

The fourth proportional to 19,418.80, 29,128.12 and 7,729.28 is: 11,593.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,418.80 : 29,128.12 = 7,729.28 : x
  2. Step 2: Convert to fraction form
    19,418.80/29,128.12 = 7,729.28/x
  3. Step 3: Cross multiply
    19,418.80x = 29,128.12 × 7,729.28
  4. Step 4: Simplify right side
    19,418.80x = 225,139,395.35
  5. Step 5: Solve for x
    x = 225,139,395.35/19,418.80
  6. Step 6: Final answer
    x = 11,593.89

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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.