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Finding the Fourth Proportional to 720,878.22, 1,081,633.62 and 342,072.78

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Solution

The fourth proportional to 720,878.22, 1,081,633.62 and 342,072.78 is: 513,259.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,878.22 : 1,081,633.62 = 342,072.78 : x
  2. Step 2: Convert to fraction form
    720,878.22/1,081,633.62 = 342,072.78/x
  3. Step 3: Cross multiply
    720,878.22x = 1,081,633.62 × 342,072.78
  4. Step 4: Simplify right side
    720,878.22x = 369,997,419,334.86
  5. Step 5: Solve for x
    x = 369,997,419,334.86/720,878.22
  6. Step 6: Final answer
    x = 513,259.26

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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.