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Finding the Fourth Proportional to 1,319,929.22, 1,821,528.18 and 861,337.19

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Solution

The fourth proportional to 1,319,929.22, 1,821,528.18 and 861,337.19 is: 1,188,662.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319,929.22 : 1,821,528.18 = 861,337.19 : x
  2. Step 2: Convert to fraction form
    1,319,929.22/1,821,528.18 = 861,337.19/x
  3. Step 3: Cross multiply
    1,319,929.22x = 1,821,528.18 × 861,337.19
  4. Step 4: Simplify right side
    1,319,929.22x = 1,568,949,968,620.83
  5. Step 5: Solve for x
    x = 1,568,949,968,620.83/1,319,929.22
  6. Step 6: Final answer
    x = 1,188,662.20

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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.