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Finding the Fourth Proportional to 118,986.53, 178,422.78 and 69,080.41

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Solution

The fourth proportional to 118,986.53, 178,422.78 and 69,080.41 is: 103,587.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,986.53 : 178,422.78 = 69,080.41 : x
  2. Step 2: Convert to fraction form
    118,986.53/178,422.78 = 69,080.41/x
  3. Step 3: Cross multiply
    118,986.53x = 178,422.78 × 69,080.41
  4. Step 4: Simplify right side
    118,986.53x = 12,325,517,903.63
  5. Step 5: Solve for x
    x = 12,325,517,903.63/118,986.53
  6. Step 6: Final answer
    x = 103,587.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.