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Finding the Fourth Proportional to 135,378, 186,823.08 and 74,949.60

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Solution

The fourth proportional to 135,378, 186,823.08 and 74,949.60 is: 103,431.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,378 : 186,823.08 = 74,949.60 : x
  2. Step 2: Convert to fraction form
    135,378/186,823.08 = 74,949.60/x
  3. Step 3: Cross multiply
    135,378x = 186,823.08 × 74,949.60
  4. Step 4: Simplify right side
    135,378x = 14,002,315,116.77
  5. Step 5: Solve for x
    x = 14,002,315,116.77/135,378
  6. Step 6: Final answer
    x = 103,431.25

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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.