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Finding the Fourth Proportional to 70,473, 105,709.50 and 21,225

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Solution

The fourth proportional to 70,473, 105,709.50 and 21,225 is: 31,837.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,473 : 105,709.50 = 21,225 : x
  2. Step 2: Convert to fraction form
    70,473/105,709.50 = 21,225/x
  3. Step 3: Cross multiply
    70,473x = 105,709.50 × 21,225
  4. Step 4: Simplify right side
    70,473x = 2,243,684,137.50
  5. Step 5: Solve for x
    x = 2,243,684,137.50/70,473
  6. Step 6: Final answer
    x = 31,837.50

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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.