Home / 78,129.24-117,146.61-30,687.54

Finding the Fourth Proportional to 78,129.24, 117,146.61 and 30,687.54

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Solution

The fourth proportional to 78,129.24, 117,146.61 and 30,687.54 is: 46,012.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,129.24 : 117,146.61 = 30,687.54 : x
  2. Step 2: Convert to fraction form
    78,129.24/117,146.61 = 30,687.54/x
  3. Step 3: Cross multiply
    78,129.24x = 117,146.61 × 30,687.54
  4. Step 4: Simplify right side
    78,129.24x = 3,594,941,280.24
  5. Step 5: Solve for x
    x = 3,594,941,280.24/78,129.24
  6. Step 6: Final answer
    x = 46,012.75

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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.