Home / 28,212.78-38,934.90-15,636.72

Finding the Fourth Proportional to 28,212.78, 38,934.90 and 15,636.72

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Solution

The fourth proportional to 28,212.78, 38,934.90 and 15,636.72 is: 21,579.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,212.78 : 38,934.90 = 15,636.72 : x
  2. Step 2: Convert to fraction form
    28,212.78/38,934.90 = 15,636.72/x
  3. Step 3: Cross multiply
    28,212.78x = 38,934.90 × 15,636.72
  4. Step 4: Simplify right side
    28,212.78x = 608,814,129.53
  5. Step 5: Solve for x
    x = 608,814,129.53/28,212.78
  6. Step 6: Final answer
    x = 21,579.37

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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.