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Finding the Fourth Proportional to 68,075.40, 102,122.70 and 21,323.40

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Solution

The fourth proportional to 68,075.40, 102,122.70 and 21,323.40 is: 31,988.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,075.40 : 102,122.70 = 21,323.40 : x
  2. Step 2: Convert to fraction form
    68,075.40/102,122.70 = 21,323.40/x
  3. Step 3: Cross multiply
    68,075.40x = 102,122.70 × 21,323.40
  4. Step 4: Simplify right side
    68,075.40x = 2,177,603,181.18
  5. Step 5: Solve for x
    x = 2,177,603,181.18/68,075.40
  6. Step 6: Final answer
    x = 31,988.11

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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.