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Finding the Fourth Proportional to 1,986,310.96, 2,979,762.86 and 921,460.64

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Solution

The fourth proportional to 1,986,310.96, 2,979,762.86 and 921,460.64 is: 1,382,328.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986,310.96 : 2,979,762.86 = 921,460.64 : x
  2. Step 2: Convert to fraction form
    1,986,310.96/2,979,762.86 = 921,460.64/x
  3. Step 3: Cross multiply
    1,986,310.96x = 2,979,762.86 × 921,460.64
  4. Step 4: Simplify right side
    1,986,310.96x = 2,745,734,192,023.83
  5. Step 5: Solve for x
    x = 2,745,734,192,023.83/1,986,310.96
  6. Step 6: Final answer
    x = 1,382,328.47

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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.