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Finding the Fourth Proportional to 68,712.80, 103,059.60 and 21,970.40

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Solution

The fourth proportional to 68,712.80, 103,059.60 and 21,970.40 is: 32,952.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,712.80 : 103,059.60 = 21,970.40 : x
  2. Step 2: Convert to fraction form
    68,712.80/103,059.60 = 21,970.40/x
  3. Step 3: Cross multiply
    68,712.80x = 103,059.60 × 21,970.40
  4. Step 4: Simplify right side
    68,712.80x = 2,264,260,635.84
  5. Step 5: Solve for x
    x = 2,264,260,635.84/68,712.80
  6. Step 6: Final answer
    x = 32,952.53

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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.