Home / 28,536.69-39,379.71-15,789.72

Finding the Fourth Proportional to 28,536.69, 39,379.71 and 15,789.72

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Solution

The fourth proportional to 28,536.69, 39,379.71 and 15,789.72 is: 21,789.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,536.69 : 39,379.71 = 15,789.72 : x
  2. Step 2: Convert to fraction form
    28,536.69/39,379.71 = 15,789.72/x
  3. Step 3: Cross multiply
    28,536.69x = 39,379.71 × 15,789.72
  4. Step 4: Simplify right side
    28,536.69x = 621,794,594.58
  5. Step 5: Solve for x
    x = 621,794,594.58/28,536.69
  6. Step 6: Final answer
    x = 21,789.30

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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.