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Finding the Fourth Proportional to 13,783.68, 20,665.80 and 4,420.80

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Solution

The fourth proportional to 13,783.68, 20,665.80 and 4,420.80 is: 6,628.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,783.68 : 20,665.80 = 4,420.80 : x
  2. Step 2: Convert to fraction form
    13,783.68/20,665.80 = 4,420.80/x
  3. Step 3: Cross multiply
    13,783.68x = 20,665.80 × 4,420.80
  4. Step 4: Simplify right side
    13,783.68x = 91,359,368.64
  5. Step 5: Solve for x
    x = 91,359,368.64/13,783.68
  6. Step 6: Final answer
    x = 6,628.08

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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.