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Finding the Fourth Proportional to 128,991.96, 178,018.44 and 78,006.60

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Solution

The fourth proportional to 128,991.96, 178,018.44 and 78,006.60 is: 107,654.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,991.96 : 178,018.44 = 78,006.60 : x
  2. Step 2: Convert to fraction form
    128,991.96/178,018.44 = 78,006.60/x
  3. Step 3: Cross multiply
    128,991.96x = 178,018.44 × 78,006.60
  4. Step 4: Simplify right side
    128,991.96x = 13,886,613,241.70
  5. Step 5: Solve for x
    x = 13,886,613,241.70/128,991.96
  6. Step 6: Final answer
    x = 107,654.87

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1.5x scale

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.