Home / 78,040,240-117,035,548.80-72,945,479.68

Finding the Fourth Proportional to 78,040,240, 117,035,548.80 and 72,945,479.68

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Solution

The fourth proportional to 78,040,240, 117,035,548.80 and 72,945,479.68 is: 109,395,028.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,040,240 : 117,035,548.80 = 72,945,479.68 : x
  2. Step 2: Convert to fraction form
    78,040,240/117,035,548.80 = 72,945,479.68/x
  3. Step 3: Cross multiply
    78,040,240x = 117,035,548.80 × 72,945,479.68
  4. Step 4: Simplify right side
    78,040,240x = 8,537,214,246,828,049
  5. Step 5: Solve for x
    x = 8,537,214,246,828,049/78,040,240
  6. Step 6: Final answer
    x = 109,395,028.09

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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.