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Finding the Fourth Proportional to 1,317,700.86, 1,976,537.57 and 678,183.77

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Solution

The fourth proportional to 1,317,700.86, 1,976,537.57 and 678,183.77 is: 1,017,268.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317,700.86 : 1,976,537.57 = 678,183.77 : x
  2. Step 2: Convert to fraction form
    1,317,700.86/1,976,537.57 = 678,183.77/x
  3. Step 3: Cross multiply
    1,317,700.86x = 1,976,537.57 × 678,183.77
  4. Step 4: Simplify right side
    1,317,700.86x = 1,340,455,687,495.63
  5. Step 5: Solve for x
    x = 1,340,455,687,495.63/1,317,700.86
  6. Step 6: Final answer
    x = 1,017,268.58

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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.