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Finding the Fourth Proportional to 865,920.80, 1,296,256.80 and 629,724.80

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Solution

The fourth proportional to 865,920.80, 1,296,256.80 and 629,724.80 is: 942,678.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,920.80 : 1,296,256.80 = 629,724.80 : x
  2. Step 2: Convert to fraction form
    865,920.80/1,296,256.80 = 629,724.80/x
  3. Step 3: Cross multiply
    865,920.80x = 1,296,256.80 × 629,724.80
  4. Step 4: Simplify right side
    865,920.80x = 816,285,054,128.64
  5. Step 5: Solve for x
    x = 816,285,054,128.64/865,920.80
  6. Step 6: Final answer
    x = 942,678.65

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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.