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Finding the Fourth Proportional to 70,787.88, 106,165.44 and 20,871.36

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Solution

The fourth proportional to 70,787.88, 106,165.44 and 20,871.36 is: 31,302.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,787.88 : 106,165.44 = 20,871.36 : x
  2. Step 2: Convert to fraction form
    70,787.88/106,165.44 = 20,871.36/x
  3. Step 3: Cross multiply
    70,787.88x = 106,165.44 × 20,871.36
  4. Step 4: Simplify right side
    70,787.88x = 2,215,817,117.80
  5. Step 5: Solve for x
    x = 2,215,817,117.80/70,787.88
  6. Step 6: Final answer
    x = 31,302.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.