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Finding the Fourth Proportional to 128,809.44, 177,739.92 and 71,447.94

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Solution

The fourth proportional to 128,809.44, 177,739.92 and 71,447.94 is: 98,588.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,809.44 : 177,739.92 = 71,447.94 : x
  2. Step 2: Convert to fraction form
    128,809.44/177,739.92 = 71,447.94/x
  3. Step 3: Cross multiply
    128,809.44x = 177,739.92 × 71,447.94
  4. Step 4: Simplify right side
    128,809.44x = 12,699,151,139.76
  5. Step 5: Solve for x
    x = 12,699,151,139.76/128,809.44
  6. Step 6: Final answer
    x = 98,588.67

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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.