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Finding the Fourth Proportional to 68,840.48, 103,240.87 and 18,922.21

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Solution

The fourth proportional to 68,840.48, 103,240.87 and 18,922.21 is: 28,377.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,840.48 : 103,240.87 = 18,922.21 : x
  2. Step 2: Convert to fraction form
    68,840.48/103,240.87 = 18,922.21/x
  3. Step 3: Cross multiply
    68,840.48x = 103,240.87 × 18,922.21
  4. Step 4: Simplify right side
    68,840.48x = 1,953,545,117.32
  5. Step 5: Solve for x
    x = 1,953,545,117.32/68,840.48
  6. Step 6: Final answer
    x = 28,377.85

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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.