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Finding the Fourth Proportional to 70,089.30, 96,719.86 and 39,871.78

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Solution

The fourth proportional to 70,089.30, 96,719.86 and 39,871.78 is: 55,021.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,089.30 : 96,719.86 = 39,871.78 : x
  2. Step 2: Convert to fraction form
    70,089.30/96,719.86 = 39,871.78/x
  3. Step 3: Cross multiply
    70,089.30x = 96,719.86 × 39,871.78
  4. Step 4: Simplify right side
    70,089.30x = 3,856,392,563.31
  5. Step 5: Solve for x
    x = 3,856,392,563.31/70,089.30
  6. Step 6: Final answer
    x = 55,021.13

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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.