Home / 78,986.68-117,975.60-71,478.60

Finding the Fourth Proportional to 78,986.68, 117,975.60 and 71,478.60

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Solution

The fourth proportional to 78,986.68, 117,975.60 and 71,478.60 is: 106,761.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,986.68 : 117,975.60 = 71,478.60 : x
  2. Step 2: Convert to fraction form
    78,986.68/117,975.60 = 71,478.60/x
  3. Step 3: Cross multiply
    78,986.68x = 117,975.60 × 71,478.60
  4. Step 4: Simplify right side
    78,986.68x = 8,432,730,722.16
  5. Step 5: Solve for x
    x = 8,432,730,722.16/78,986.68
  6. Step 6: Final answer
    x = 106,761.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.