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Finding the Fourth Proportional to 68,679,935.10, 103,019,902.65 and 20,804,658.30

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Solution

The fourth proportional to 68,679,935.10, 103,019,902.65 and 20,804,658.30 is: 31,206,987.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,679,935.10 : 103,019,902.65 = 20,804,658.30 : x
  2. Step 2: Convert to fraction form
    68,679,935.10/103,019,902.65 = 20,804,658.30/x
  3. Step 3: Cross multiply
    68,679,935.10x = 103,019,902.65 × 20,804,658.30
  4. Step 4: Simplify right side
    68,679,935.10x = 2,143,293,872,732,514.75
  5. Step 5: Solve for x
    x = 2,143,293,872,732,514.75/68,679,935.10
  6. Step 6: Final answer
    x = 31,206,987.45

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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.