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Finding the Fourth Proportional to 68,684.80, 103,038.80 and 21,289

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Solution

The fourth proportional to 68,684.80, 103,038.80 and 21,289 is: 31,937.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,684.80 : 103,038.80 = 21,289 : x
  2. Step 2: Convert to fraction form
    68,684.80/103,038.80 = 21,289/x
  3. Step 3: Cross multiply
    68,684.80x = 103,038.80 × 21,289
  4. Step 4: Simplify right side
    68,684.80x = 2,193,593,013.20
  5. Step 5: Solve for x
    x = 2,193,593,013.20/68,684.80
  6. Step 6: Final answer
    x = 31,937.10

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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.