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Finding the Fourth Proportional to 39,160, 54,040.38 and 21,255.64

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Solution

The fourth proportional to 39,160, 54,040.38 and 21,255.64 is: 29,332.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,160 : 54,040.38 = 21,255.64 : x
  2. Step 2: Convert to fraction form
    39,160/54,040.38 = 21,255.64/x
  3. Step 3: Cross multiply
    39,160x = 54,040.38 × 21,255.64
  4. Step 4: Simplify right side
    39,160x = 1,148,662,862.74
  5. Step 5: Solve for x
    x = 1,148,662,862.74/39,160
  6. Step 6: Final answer
    x = 29,332.56

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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.