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Finding the Fourth Proportional to 128,978.62, 177,986.94 and 77,324.92

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Solution

The fourth proportional to 128,978.62, 177,986.94 and 77,324.92 is: 106,706.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,978.62 : 177,986.94 = 77,324.92 : x
  2. Step 2: Convert to fraction form
    128,978.62/177,986.94 = 77,324.92/x
  3. Step 3: Cross multiply
    128,978.62x = 177,986.94 × 77,324.92
  4. Step 4: Simplify right side
    128,978.62x = 13,762,825,896.54
  5. Step 5: Solve for x
    x = 13,762,825,896.54/128,978.62
  6. Step 6: Final answer
    x = 106,706.26

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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.