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Finding the Fourth Proportional to 39,798.71, 54,921.81 and 21,893.74

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Solution

The fourth proportional to 39,798.71, 54,921.81 and 21,893.74 is: 30,213.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,798.71 : 54,921.81 = 21,893.74 : x
  2. Step 2: Convert to fraction form
    39,798.71/54,921.81 = 21,893.74/x
  3. Step 3: Cross multiply
    39,798.71x = 54,921.81 × 21,893.74
  4. Step 4: Simplify right side
    39,798.71x = 1,202,444,082.20
  5. Step 5: Solve for x
    x = 1,202,444,082.20/39,798.71
  6. Step 6: Final answer
    x = 30,213.14

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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.