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Finding the Fourth Proportional to 85,804,879.20, 128,707,318.80 and 85,804,879.20

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Solution

The fourth proportional to 85,804,879.20, 128,707,318.80 and 85,804,879.20 is: 128,707,318.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,804,879.20 : 128,707,318.80 = 85,804,879.20 : x
  2. Step 2: Convert to fraction form
    85,804,879.20/128,707,318.80 = 85,804,879.20/x
  3. Step 3: Cross multiply
    85,804,879.20x = 128,707,318.80 × 85,804,879.20
  4. Step 4: Simplify right side
    85,804,879.20x = 11,043,715,941,789,890
  5. Step 5: Solve for x
    x = 11,043,715,941,789,890/85,804,879.20
  6. Step 6: Final answer
    x = 128,707,318.80

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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.