Home / 21,425.31-29,745.02-20,783.79

Finding the Fourth Proportional to 21,425.31, 29,745.02 and 20,783.79

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Solution

The fourth proportional to 21,425.31, 29,745.02 and 20,783.79 is: 28,854.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,425.31 : 29,745.02 = 20,783.79 : x
  2. Step 2: Convert to fraction form
    21,425.31/29,745.02 = 20,783.79/x
  3. Step 3: Cross multiply
    21,425.31x = 29,745.02 × 20,783.79
  4. Step 4: Simplify right side
    21,425.31x = 618,214,301.19
  5. Step 5: Solve for x
    x = 618,214,301.19/21,425.31
  6. Step 6: Final answer
    x = 28,854.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.