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Finding the Fourth Proportional to 70,709.84, 106,064.72 and 20,790.35

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Solution

The fourth proportional to 70,709.84, 106,064.72 and 20,790.35 is: 31,185.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,709.84 : 106,064.72 = 20,790.35 : x
  2. Step 2: Convert to fraction form
    70,709.84/106,064.72 = 20,790.35/x
  3. Step 3: Cross multiply
    70,709.84x = 106,064.72 × 20,790.35
  4. Step 4: Simplify right side
    70,709.84x = 2,205,122,492.88
  5. Step 5: Solve for x
    x = 2,205,122,492.88/70,709.84
  6. Step 6: Final answer
    x = 31,185.51

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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.