Home / 20,865.31-28,777.36-18,342.05

Finding the Fourth Proportional to 20,865.31, 28,777.36 and 18,342.05

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Solution

The fourth proportional to 20,865.31, 28,777.36 and 18,342.05 is: 25,297.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,865.31 : 28,777.36 = 18,342.05 : x
  2. Step 2: Convert to fraction form
    20,865.31/28,777.36 = 18,342.05/x
  3. Step 3: Cross multiply
    20,865.31x = 28,777.36 × 18,342.05
  4. Step 4: Simplify right side
    20,865.31x = 527,835,775.99
  5. Step 5: Solve for x
    x = 527,835,775.99/20,865.31
  6. Step 6: Final answer
    x = 25,297.29

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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.