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Finding the Fourth Proportional to 68,809.31, 103,116.30 and 28,785.16

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Solution

The fourth proportional to 68,809.31, 103,116.30 and 28,785.16 is: 43,136.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,809.31 : 103,116.30 = 28,785.16 : x
  2. Step 2: Convert to fraction form
    68,809.31/103,116.30 = 28,785.16/x
  3. Step 3: Cross multiply
    68,809.31x = 103,116.30 × 28,785.16
  4. Step 4: Simplify right side
    68,809.31x = 2,968,219,194.11
  5. Step 5: Solve for x
    x = 2,968,219,194.11/68,809.31
  6. Step 6: Final answer
    x = 43,136.88

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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.