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Finding the Fourth Proportional to 39,628.68, 54,688.02 and 21,723.30

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Solution

The fourth proportional to 39,628.68, 54,688.02 and 21,723.30 is: 29,978.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,628.68 : 54,688.02 = 21,723.30 : x
  2. Step 2: Convert to fraction form
    39,628.68/54,688.02 = 21,723.30/x
  3. Step 3: Cross multiply
    39,628.68x = 54,688.02 × 21,723.30
  4. Step 4: Simplify right side
    39,628.68x = 1,188,004,264.87
  5. Step 5: Solve for x
    x = 1,188,004,264.87/39,628.68
  6. Step 6: Final answer
    x = 29,978.40

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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.