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Finding the Fourth Proportional to 85,879,046.80, 128,818,570.20 and 85,879,046.80

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Solution

The fourth proportional to 85,879,046.80, 128,818,570.20 and 85,879,046.80 is: 128,818,570.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,879,046.80 : 128,818,570.20 = 85,879,046.80 : x
  2. Step 2: Convert to fraction form
    85,879,046.80/128,818,570.20 = 85,879,046.80/x
  3. Step 3: Cross multiply
    85,879,046.80x = 128,818,570.20 × 85,879,046.80
  4. Step 4: Simplify right side
    85,879,046.80x = 11,062,816,018,914,886
  5. Step 5: Solve for x
    x = 11,062,816,018,914,886/85,879,046.80
  6. Step 6: Final answer
    x = 128,818,570.20

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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.