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Finding the Fourth Proportional to 68,706, 103,073.70 and 21,320.07

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Solution

The fourth proportional to 68,706, 103,073.70 and 21,320.07 is: 31,984.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,706 : 103,073.70 = 21,320.07 : x
  2. Step 2: Convert to fraction form
    68,706/103,073.70 = 21,320.07/x
  3. Step 3: Cross multiply
    68,706x = 103,073.70 × 21,320.07
  4. Step 4: Simplify right side
    68,706x = 2,197,538,499.16
  5. Step 5: Solve for x
    x = 2,197,538,499.16/68,706
  6. Step 6: Final answer
    x = 31,984.67

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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.