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Finding the Fourth Proportional to 39,772.55, 54,887.07 and 21,867.90

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Solution

The fourth proportional to 39,772.55, 54,887.07 and 21,867.90 is: 30,178.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,772.55 : 54,887.07 = 21,867.90 : x
  2. Step 2: Convert to fraction form
    39,772.55/54,887.07 = 21,867.90/x
  3. Step 3: Cross multiply
    39,772.55x = 54,887.07 × 21,867.90
  4. Step 4: Simplify right side
    39,772.55x = 1,200,264,958.05
  5. Step 5: Solve for x
    x = 1,200,264,958.05/39,772.55
  6. Step 6: Final answer
    x = 30,178.23

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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.