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Finding the Fourth Proportional to 1,218,951.87, 1,821,015.15 and 788,984.91

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Solution

The fourth proportional to 1,218,951.87, 1,821,015.15 and 788,984.91 is: 1,178,679.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218,951.87 : 1,821,015.15 = 788,984.91 : x
  2. Step 2: Convert to fraction form
    1,218,951.87/1,821,015.15 = 788,984.91/x
  3. Step 3: Cross multiply
    1,218,951.87x = 1,821,015.15 × 788,984.91
  4. Step 4: Simplify right side
    1,218,951.87x = 1,436,753,474,231.39
  5. Step 5: Solve for x
    x = 1,436,753,474,231.39/1,218,951.87
  6. Step 6: Final answer
    x = 1,178,679.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.