Home / 20,319.12-30,487.74-12,921.60

Finding the Fourth Proportional to 20,319.12, 30,487.74 and 12,921.60

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Solution

The fourth proportional to 20,319.12, 30,487.74 and 12,921.60 is: 19,388.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,319.12 : 30,487.74 = 12,921.60 : x
  2. Step 2: Convert to fraction form
    20,319.12/30,487.74 = 12,921.60/x
  3. Step 3: Cross multiply
    20,319.12x = 30,487.74 × 12,921.60
  4. Step 4: Simplify right side
    20,319.12x = 393,950,381.18
  5. Step 5: Solve for x
    x = 393,950,381.18/20,319.12
  6. Step 6: Final answer
    x = 19,388.16

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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.