Home / 78,137.14-117,205.49-18,972.81

Finding the Fourth Proportional to 78,137.14, 117,205.49 and 18,972.81

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Solution

The fourth proportional to 78,137.14, 117,205.49 and 18,972.81 is: 28,459.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,137.14 : 117,205.49 = 18,972.81 : x
  2. Step 2: Convert to fraction form
    78,137.14/117,205.49 = 18,972.81/x
  3. Step 3: Cross multiply
    78,137.14x = 117,205.49 × 18,972.81
  4. Step 4: Simplify right side
    78,137.14x = 2,223,717,127.73
  5. Step 5: Solve for x
    x = 2,223,717,127.73/78,137.14
  6. Step 6: Final answer
    x = 28,459.16

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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.