Home / 28,380.89-39,150.77-21,654.86

Finding the Fourth Proportional to 28,380.89, 39,150.77 and 21,654.86

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Solution

The fourth proportional to 28,380.89, 39,150.77 and 21,654.86 is: 29,872.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,380.89 : 39,150.77 = 21,654.86 : x
  2. Step 2: Convert to fraction form
    28,380.89/39,150.77 = 21,654.86/x
  3. Step 3: Cross multiply
    28,380.89x = 39,150.77 × 21,654.86
  4. Step 4: Simplify right side
    28,380.89x = 847,804,139.21
  5. Step 5: Solve for x
    x = 847,804,139.21/28,380.89
  6. Step 6: Final answer
    x = 29,872.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.