Home / 20,745.26-31,130.19-19,431.78

Finding the Fourth Proportional to 20,745.26, 31,130.19 and 19,431.78

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Solution

The fourth proportional to 20,745.26, 31,130.19 and 19,431.78 is: 29,159.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,745.26 : 31,130.19 = 19,431.78 : x
  2. Step 2: Convert to fraction form
    20,745.26/31,130.19 = 19,431.78/x
  3. Step 3: Cross multiply
    20,745.26x = 31,130.19 × 19,431.78
  4. Step 4: Simplify right side
    20,745.26x = 604,914,886.70
  5. Step 5: Solve for x
    x = 604,914,886.70/20,745.26
  6. Step 6: Final answer
    x = 29,159.19

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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.