Home / 28,779.16-39,712.38-21,229.58

Finding the Fourth Proportional to 28,779.16, 39,712.38 and 21,229.58

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Solution

The fourth proportional to 28,779.16, 39,712.38 and 21,229.58 is: 29,294.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,779.16 : 39,712.38 = 21,229.58 : x
  2. Step 2: Convert to fraction form
    28,779.16/39,712.38 = 21,229.58/x
  3. Step 3: Cross multiply
    28,779.16x = 39,712.38 × 21,229.58
  4. Step 4: Simplify right side
    28,779.16x = 843,077,148.20
  5. Step 5: Solve for x
    x = 843,077,148.20/28,779.16
  6. Step 6: Final answer
    x = 29,294.71

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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.