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Finding the Fourth Proportional to 70,311, 105,466.50 and 21,063

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Solution

The fourth proportional to 70,311, 105,466.50 and 21,063 is: 31,594.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,311 : 105,466.50 = 21,063 : x
  2. Step 2: Convert to fraction form
    70,311/105,466.50 = 21,063/x
  3. Step 3: Cross multiply
    70,311x = 105,466.50 × 21,063
  4. Step 4: Simplify right side
    70,311x = 2,221,440,889.50
  5. Step 5: Solve for x
    x = 2,221,440,889.50/70,311
  6. Step 6: Final answer
    x = 31,594.50

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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.