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Finding the Fourth Proportional to 68,120.80, 102,139.04 and 28,657.60

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Solution

The fourth proportional to 68,120.80, 102,139.04 and 28,657.60 is: 42,968.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,120.80 : 102,139.04 = 28,657.60 : x
  2. Step 2: Convert to fraction form
    68,120.80/102,139.04 = 28,657.60/x
  3. Step 3: Cross multiply
    68,120.80x = 102,139.04 × 28,657.60
  4. Step 4: Simplify right side
    68,120.80x = 2,927,059,752.70
  5. Step 5: Solve for x
    x = 2,927,059,752.70/68,120.80
  6. Step 6: Final answer
    x = 42,968.66

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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.