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Finding the Fourth Proportional to 39,881.89, 55,034.53 and 21,975.90

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Solution

The fourth proportional to 39,881.89, 55,034.53 and 21,975.90 is: 30,325.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,881.89 : 55,034.53 = 21,975.90 : x
  2. Step 2: Convert to fraction form
    39,881.89/55,034.53 = 21,975.90/x
  3. Step 3: Cross multiply
    39,881.89x = 55,034.53 × 21,975.90
  4. Step 4: Simplify right side
    39,881.89x = 1,209,433,327.83
  5. Step 5: Solve for x
    x = 1,209,433,327.83/39,881.89
  6. Step 6: Final answer
    x = 30,325.38

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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.