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Finding the Fourth Proportional to 128,808.63, 177,719.57 and 83,488.52

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Solution

The fourth proportional to 128,808.63, 177,719.57 and 83,488.52 is: 115,190.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,808.63 : 177,719.57 = 83,488.52 : x
  2. Step 2: Convert to fraction form
    128,808.63/177,719.57 = 83,488.52/x
  3. Step 3: Cross multiply
    128,808.63x = 177,719.57 × 83,488.52
  4. Step 4: Simplify right side
    128,808.63x = 14,837,544,214.27
  5. Step 5: Solve for x
    x = 14,837,544,214.27/128,808.63
  6. Step 6: Final answer
    x = 115,190.61

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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.