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Finding the Fourth Proportional to 93,149.56, 128,696.70 and 64,981

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Solution

The fourth proportional to 93,149.56, 128,696.70 and 64,981 is: 89,778.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,149.56 : 128,696.70 = 64,981 : x
  2. Step 2: Convert to fraction form
    93,149.56/128,696.70 = 64,981/x
  3. Step 3: Cross multiply
    93,149.56x = 128,696.70 × 64,981
  4. Step 4: Simplify right side
    93,149.56x = 8,362,840,262.70
  5. Step 5: Solve for x
    x = 8,362,840,262.70/93,149.56
  6. Step 6: Final answer
    x = 89,778.63

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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.