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Finding the Fourth Proportional to 68,439.30, 94,457.64 and 66,640.49

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Solution

The fourth proportional to 68,439.30, 94,457.64 and 66,640.49 is: 91,974.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,439.30 : 94,457.64 = 66,640.49 : x
  2. Step 2: Convert to fraction form
    68,439.30/94,457.64 = 66,640.49/x
  3. Step 3: Cross multiply
    68,439.30x = 94,457.64 × 66,640.49
  4. Step 4: Simplify right side
    68,439.30x = 6,294,702,941.56
  5. Step 5: Solve for x
    x = 6,294,702,941.56/68,439.30
  6. Step 6: Final answer
    x = 91,974.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.