Home / 28,354.05-39,129.89-15,779.61

Finding the Fourth Proportional to 28,354.05, 39,129.89 and 15,779.61

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Solution

The fourth proportional to 28,354.05, 39,129.89 and 15,779.61 is: 21,776.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,354.05 : 39,129.89 = 15,779.61 : x
  2. Step 2: Convert to fraction form
    28,354.05/39,129.89 = 15,779.61/x
  3. Step 3: Cross multiply
    28,354.05x = 39,129.89 × 15,779.61
  4. Step 4: Simplify right side
    28,354.05x = 617,454,324.64
  5. Step 5: Solve for x
    x = 617,454,324.64/28,354.05
  6. Step 6: Final answer
    x = 21,776.58

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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.