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Finding the Fourth Proportional to 19,007,985.40, 28,511,978.10 and 12,961,367.80

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Solution

The fourth proportional to 19,007,985.40, 28,511,978.10 and 12,961,367.80 is: 19,442,051.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,007,985.40 : 28,511,978.10 = 12,961,367.80 : x
  2. Step 2: Convert to fraction form
    19,007,985.40/28,511,978.10 = 12,961,367.80/x
  3. Step 3: Cross multiply
    19,007,985.40x = 28,511,978.10 × 12,961,367.80
  4. Step 4: Simplify right side
    19,007,985.40x = 369,554,234,859,645.25
  5. Step 5: Solve for x
    x = 369,554,234,859,645.25/19,007,985.40
  6. Step 6: Final answer
    x = 19,442,051.70

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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.