Home / 20,430.46-28,193.38-11,355.78

Finding the Fourth Proportional to 20,430.46, 28,193.38 and 11,355.78

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Solution

The fourth proportional to 20,430.46, 28,193.38 and 11,355.78 is: 15,670.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.46 : 28,193.38 = 11,355.78 : x
  2. Step 2: Convert to fraction form
    20,430.46/28,193.38 = 11,355.78/x
  3. Step 3: Cross multiply
    20,430.46x = 28,193.38 × 11,355.78
  4. Step 4: Simplify right side
    20,430.46x = 320,157,622.99
  5. Step 5: Solve for x
    x = 320,157,622.99/20,430.46
  6. Step 6: Final answer
    x = 15,670.61

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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.