Home / 28,621.71-39,500.39-15,879

Finding the Fourth Proportional to 28,621.71, 39,500.39 and 15,879

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Solution

The fourth proportional to 28,621.71, 39,500.39 and 15,879 is: 21,914.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,621.71 : 39,500.39 = 15,879 : x
  2. Step 2: Convert to fraction form
    28,621.71/39,500.39 = 15,879/x
  3. Step 3: Cross multiply
    28,621.71x = 39,500.39 × 15,879
  4. Step 4: Simplify right side
    28,621.71x = 627,226,613.42
  5. Step 5: Solve for x
    x = 627,226,613.42/28,621.71
  6. Step 6: Final answer
    x = 21,914.37

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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.