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Finding the Fourth Proportional to 1,278,352.98, 1,916,907.39 and 679,600.98

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Solution

The fourth proportional to 1,278,352.98, 1,916,907.39 and 679,600.98 is: 1,019,070.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278,352.98 : 1,916,907.39 = 679,600.98 : x
  2. Step 2: Convert to fraction form
    1,278,352.98/1,916,907.39 = 679,600.98/x
  3. Step 3: Cross multiply
    1,278,352.98x = 1,916,907.39 × 679,600.98
  4. Step 4: Simplify right side
    1,278,352.98x = 1,302,732,140,813.24
  5. Step 5: Solve for x
    x = 1,302,732,140,813.24/1,278,352.98
  6. Step 6: Final answer
    x = 1,019,070.76

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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.