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Finding the Fourth Proportional to 71,388.88, 98,516.61 and 42,709.75

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Solution

The fourth proportional to 71,388.88, 98,516.61 and 42,709.75 is: 58,939.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,388.88 : 98,516.61 = 42,709.75 : x
  2. Step 2: Convert to fraction form
    71,388.88/98,516.61 = 42,709.75/x
  3. Step 3: Cross multiply
    71,388.88x = 98,516.61 × 42,709.75
  4. Step 4: Simplify right side
    71,388.88x = 4,207,619,783.95
  5. Step 5: Solve for x
    x = 4,207,619,783.95/71,388.88
  6. Step 6: Final answer
    x = 58,939.43

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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.