Home / 128,976.60-177,986.78-71,615.64

Finding the Fourth Proportional to 128,976.60, 177,986.78 and 71,615.64

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Solution

The fourth proportional to 128,976.60, 177,986.78 and 71,615.64 is: 98,829.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,976.60 : 177,986.78 = 71,615.64 : x
  2. Step 2: Convert to fraction form
    128,976.60/177,986.78 = 71,615.64/x
  3. Step 3: Cross multiply
    128,976.60x = 177,986.78 × 71,615.64
  4. Step 4: Simplify right side
    128,976.60x = 12,746,638,142.01
  5. Step 5: Solve for x
    x = 12,746,638,142.01/128,976.60
  6. Step 6: Final answer
    x = 98,829.07

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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.