Home / 28,354.88-39,129.86-15,779.63

Finding the Fourth Proportional to 28,354.88, 39,129.86 and 15,779.63

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Solution

The fourth proportional to 28,354.88, 39,129.86 and 15,779.63 is: 21,775.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,354.88 : 39,129.86 = 15,779.63 : x
  2. Step 2: Convert to fraction form
    28,354.88/39,129.86 = 15,779.63/x
  3. Step 3: Cross multiply
    28,354.88x = 39,129.86 × 15,779.63
  4. Step 4: Simplify right side
    28,354.88x = 617,454,850.03
  5. Step 5: Solve for x
    x = 617,454,850.03/28,354.88
  6. Step 6: Final answer
    x = 21,775.96

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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.