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Finding the Fourth Proportional to 93,063.78, 128,370.42 and 81,155.70

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Solution

The fourth proportional to 93,063.78, 128,370.42 and 81,155.70 is: 111,944.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,063.78 : 128,370.42 = 81,155.70 : x
  2. Step 2: Convert to fraction form
    93,063.78/128,370.42 = 81,155.70/x
  3. Step 3: Cross multiply
    93,063.78x = 128,370.42 × 81,155.70
  4. Step 4: Simplify right side
    93,063.78x = 10,417,991,294.39
  5. Step 5: Solve for x
    x = 10,417,991,294.39/93,063.78
  6. Step 6: Final answer
    x = 111,944.64

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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.