Home / 78,002.40-117,003.60-31,288.80

Finding the Fourth Proportional to 78,002.40, 117,003.60 and 31,288.80

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Solution

The fourth proportional to 78,002.40, 117,003.60 and 31,288.80 is: 46,933.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,002.40 : 117,003.60 = 31,288.80 : x
  2. Step 2: Convert to fraction form
    78,002.40/117,003.60 = 31,288.80/x
  3. Step 3: Cross multiply
    78,002.40x = 117,003.60 × 31,288.80
  4. Step 4: Simplify right side
    78,002.40x = 3,660,902,239.68
  5. Step 5: Solve for x
    x = 3,660,902,239.68/78,002.40
  6. Step 6: Final answer
    x = 46,933.20

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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.