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Finding the Fourth Proportional to 29,160, 40,240.80 and 15,912

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Solution

The fourth proportional to 29,160, 40,240.80 and 15,912 is: 21,958.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,160 : 40,240.80 = 15,912 : x
  2. Step 2: Convert to fraction form
    29,160/40,240.80 = 15,912/x
  3. Step 3: Cross multiply
    29,160x = 40,240.80 × 15,912
  4. Step 4: Simplify right side
    29,160x = 640,311,609.60
  5. Step 5: Solve for x
    x = 640,311,609.60/29,160
  6. Step 6: Final answer
    x = 21,958.56

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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.