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Finding the Fourth Proportional to 68,727.60, 103,091.40 and 21,985.20

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Solution

The fourth proportional to 68,727.60, 103,091.40 and 21,985.20 is: 32,977.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,727.60 : 103,091.40 = 21,985.20 : x
  2. Step 2: Convert to fraction form
    68,727.60/103,091.40 = 21,985.20/x
  3. Step 3: Cross multiply
    68,727.60x = 103,091.40 × 21,985.20
  4. Step 4: Simplify right side
    68,727.60x = 2,266,485,047.28
  5. Step 5: Solve for x
    x = 2,266,485,047.28/68,727.60
  6. Step 6: Final answer
    x = 32,977.80

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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.