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Finding the Fourth Proportional to 68,683.99, 103,040.78 and 21,298.13

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Solution

The fourth proportional to 68,683.99, 103,040.78 and 21,298.13 is: 31,951.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,683.99 : 103,040.78 = 21,298.13 : x
  2. Step 2: Convert to fraction form
    68,683.99/103,040.78 = 21,298.13/x
  3. Step 3: Cross multiply
    68,683.99x = 103,040.78 × 21,298.13
  4. Step 4: Simplify right side
    68,683.99x = 2,194,575,812.25
  5. Step 5: Solve for x
    x = 2,194,575,812.25/68,683.99
  6. Step 6: Final answer
    x = 31,951.78

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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.