Home / 20,420.61-30,626.05-7,940.13

Finding the Fourth Proportional to 20,420.61, 30,626.05 and 7,940.13

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Solution

The fourth proportional to 20,420.61, 30,626.05 and 7,940.13 is: 11,908.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,420.61 : 30,626.05 = 7,940.13 : x
  2. Step 2: Convert to fraction form
    20,420.61/30,626.05 = 7,940.13/x
  3. Step 3: Cross multiply
    20,420.61x = 30,626.05 × 7,940.13
  4. Step 4: Simplify right side
    20,420.61x = 243,174,818.39
  5. Step 5: Solve for x
    x = 243,174,818.39/20,420.61
  6. Step 6: Final answer
    x = 11,908.30

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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.