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Finding the Fourth Proportional to 20,484.96, 28,270.80 and 12,420.96

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Solution

The fourth proportional to 20,484.96, 28,270.80 and 12,420.96 is: 17,141.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,484.96 : 28,270.80 = 12,420.96 : x
  2. Step 2: Convert to fraction form
    20,484.96/28,270.80 = 12,420.96/x
  3. Step 3: Cross multiply
    20,484.96x = 28,270.80 × 12,420.96
  4. Step 4: Simplify right side
    20,484.96x = 351,150,475.97
  5. Step 5: Solve for x
    x = 351,150,475.97/20,484.96
  6. Step 6: Final answer
    x = 17,141.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.