Home / 20,280.55-30,420.83-7,806.45

Finding the Fourth Proportional to 20,280.55, 30,420.83 and 7,806.45

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Solution

The fourth proportional to 20,280.55, 30,420.83 and 7,806.45 is: 11,709.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,280.55 : 30,420.83 = 7,806.45 : x
  2. Step 2: Convert to fraction form
    20,280.55/30,420.83 = 7,806.45/x
  3. Step 3: Cross multiply
    20,280.55x = 30,420.83 × 7,806.45
  4. Step 4: Simplify right side
    20,280.55x = 237,478,703.46
  5. Step 5: Solve for x
    x = 237,478,703.46/20,280.55
  6. Step 6: Final answer
    x = 11,709.68

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Similar ratio
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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.