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Finding the Fourth Proportional to 5,318,916, 7,978,374 and 1,329,828

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Solution

The fourth proportional to 5,318,916, 7,978,374 and 1,329,828 is: 1,994,742

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,318,916 : 7,978,374 = 1,329,828 : x
  2. Step 2: Convert to fraction form
    5,318,916/7,978,374 = 1,329,828/x
  3. Step 3: Cross multiply
    5,318,916x = 7,978,374 × 1,329,828
  4. Step 4: Simplify right side
    5,318,916x = 10,609,865,139,672
  5. Step 5: Solve for x
    x = 10,609,865,139,672/5,318,916
  6. Step 6: Final answer
    x = 1,994,742

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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.