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Finding the Fourth Proportional to 68,763.78, 103,145.76 and 18,844.31

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Solution

The fourth proportional to 68,763.78, 103,145.76 and 18,844.31 is: 28,266.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,763.78 : 103,145.76 = 18,844.31 : x
  2. Step 2: Convert to fraction form
    68,763.78/103,145.76 = 18,844.31/x
  3. Step 3: Cross multiply
    68,763.78x = 103,145.76 × 18,844.31
  4. Step 4: Simplify right side
    68,763.78x = 1,943,710,934.49
  5. Step 5: Solve for x
    x = 1,943,710,934.49/68,763.78
  6. Step 6: Final answer
    x = 28,266.49

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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.