Home / 20,319.15-30,487.77-12,921.69

Finding the Fourth Proportional to 20,319.15, 30,487.77 and 12,921.69

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Solution

The fourth proportional to 20,319.15, 30,487.77 and 12,921.69 is: 19,388.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,319.15 : 30,487.77 = 12,921.69 : x
  2. Step 2: Convert to fraction form
    20,319.15/30,487.77 = 12,921.69/x
  3. Step 3: Cross multiply
    20,319.15x = 30,487.77 × 12,921.69
  4. Step 4: Simplify right side
    20,319.15x = 393,953,512.73
  5. Step 5: Solve for x
    x = 393,953,512.73/20,319.15
  6. Step 6: Final answer
    x = 19,388.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.