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Finding the Fourth Proportional to 39,881.78, 55,038.04 and 21,977.94

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Solution

The fourth proportional to 39,881.78, 55,038.04 and 21,977.94 is: 30,330.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,881.78 : 55,038.04 = 21,977.94 : x
  2. Step 2: Convert to fraction form
    39,881.78/55,038.04 = 21,977.94/x
  3. Step 3: Cross multiply
    39,881.78x = 55,038.04 × 21,977.94
  4. Step 4: Simplify right side
    39,881.78x = 1,209,622,479.50
  5. Step 5: Solve for x
    x = 1,209,622,479.50/39,881.78
  6. Step 6: Final answer
    x = 30,330.20

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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.