Home / 20,219.35-30,330.60-5,428.12

Finding the Fourth Proportional to 20,219.35, 30,330.60 and 5,428.12

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Solution

The fourth proportional to 20,219.35, 30,330.60 and 5,428.12 is: 8,142.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,219.35 : 30,330.60 = 5,428.12 : x
  2. Step 2: Convert to fraction form
    20,219.35/30,330.60 = 5,428.12/x
  3. Step 3: Cross multiply
    20,219.35x = 30,330.60 × 5,428.12
  4. Step 4: Simplify right side
    20,219.35x = 164,638,136.47
  5. Step 5: Solve for x
    x = 164,638,136.47/20,219.35
  6. Step 6: Final answer
    x = 8,142.60

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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.