Home / 28,515-39,351.54-15,939.78

Finding the Fourth Proportional to 28,515, 39,351.54 and 15,939.78

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Solution

The fourth proportional to 28,515, 39,351.54 and 15,939.78 is: 21,997.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,515 : 39,351.54 = 15,939.78 : x
  2. Step 2: Convert to fraction form
    28,515/39,351.54 = 15,939.78/x
  3. Step 3: Cross multiply
    28,515x = 39,351.54 × 15,939.78
  4. Step 4: Simplify right side
    28,515x = 627,254,890.26
  5. Step 5: Solve for x
    x = 627,254,890.26/28,515
  6. Step 6: Final answer
    x = 21,997.37

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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.