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Finding the Fourth Proportional to 12,456,017.10, 18,686,978.10 and 6,391,684.80

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Solution

The fourth proportional to 12,456,017.10, 18,686,978.10 and 6,391,684.80 is: 9,589,042.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,456,017.10 : 18,686,978.10 = 6,391,684.80 : x
  2. Step 2: Convert to fraction form
    12,456,017.10/18,686,978.10 = 6,391,684.80/x
  3. Step 3: Cross multiply
    12,456,017.10x = 18,686,978.10 × 6,391,684.80
  4. Step 4: Simplify right side
    12,456,017.10x = 119,441,273,879,702.89
  5. Step 5: Solve for x
    x = 119,441,273,879,702.89/12,456,017.10
  6. Step 6: Final answer
    x = 9,589,042.22

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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.