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Finding the Fourth Proportional to 108,728.54, 149,981.66 and 68,378.30

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Solution

The fourth proportional to 108,728.54, 149,981.66 and 68,378.30 is: 94,321.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,728.54 : 149,981.66 = 68,378.30 : x
  2. Step 2: Convert to fraction form
    108,728.54/149,981.66 = 68,378.30/x
  3. Step 3: Cross multiply
    108,728.54x = 149,981.66 × 68,378.30
  4. Step 4: Simplify right side
    108,728.54x = 10,255,490,941.98
  5. Step 5: Solve for x
    x = 10,255,490,941.98/108,728.54
  6. Step 6: Final answer
    x = 94,321.98

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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.