Home / 85,965,324.30-128,947,986.45-78,029,138.70

Finding the Fourth Proportional to 85,965,324.30, 128,947,986.45 and 78,029,138.70

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Solution

The fourth proportional to 85,965,324.30, 128,947,986.45 and 78,029,138.70 is: 117,043,708.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,965,324.30 : 128,947,986.45 = 78,029,138.70 : x
  2. Step 2: Convert to fraction form
    85,965,324.30/128,947,986.45 = 78,029,138.70/x
  3. Step 3: Cross multiply
    85,965,324.30x = 128,947,986.45 × 78,029,138.70
  4. Step 4: Simplify right side
    85,965,324.30x = 10,061,700,319,792,772
  5. Step 5: Solve for x
    x = 10,061,700,319,792,772/85,965,324.30
  6. Step 6: Final answer
    x = 117,043,708.05

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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.