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Finding the Fourth Proportional to 128,688.70, 192,819.60 and 91,062.22

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Solution

The fourth proportional to 128,688.70, 192,819.60 and 91,062.22 is: 136,442.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,688.70 : 192,819.60 = 91,062.22 : x
  2. Step 2: Convert to fraction form
    128,688.70/192,819.60 = 91,062.22/x
  3. Step 3: Cross multiply
    128,688.70x = 192,819.60 × 91,062.22
  4. Step 4: Simplify right side
    128,688.70x = 17,558,580,835.51
  5. Step 5: Solve for x
    x = 17,558,580,835.51/128,688.70
  6. Step 6: Final answer
    x = 136,442.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.