Home / 20,388.96-28,124.24-13,490.08

Finding the Fourth Proportional to 20,388.96, 28,124.24 and 13,490.08

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Solution

The fourth proportional to 20,388.96, 28,124.24 and 13,490.08 is: 18,608.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.96 : 28,124.24 = 13,490.08 : x
  2. Step 2: Convert to fraction form
    20,388.96/28,124.24 = 13,490.08/x
  3. Step 3: Cross multiply
    20,388.96x = 28,124.24 × 13,490.08
  4. Step 4: Simplify right side
    20,388.96x = 379,398,247.54
  5. Step 5: Solve for x
    x = 379,398,247.54/20,388.96
  6. Step 6: Final answer
    x = 18,608.02

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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.