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Finding the Fourth Proportional to 987,992.12, 1,362,676.80 and 850,405.20

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Solution

The fourth proportional to 987,992.12, 1,362,676.80 and 850,405.20 is: 1,172,911.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    987,992.12 : 1,362,676.80 = 850,405.20 : x
  2. Step 2: Convert to fraction form
    987,992.12/1,362,676.80 = 850,405.20/x
  3. Step 3: Cross multiply
    987,992.12x = 1,362,676.80 × 850,405.20
  4. Step 4: Simplify right side
    987,992.12x = 1,158,827,436,639.36
  5. Step 5: Solve for x
    x = 1,158,827,436,639.36/987,992.12
  6. Step 6: Final answer
    x = 1,172,911.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.