Home / 685,978.30-1,029,006.33-212,730.94

Finding the Fourth Proportional to 685,978.30, 1,029,006.33 and 212,730.94

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Solution

The fourth proportional to 685,978.30, 1,029,006.33 and 212,730.94 is: 319,108.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,978.30 : 1,029,006.33 = 212,730.94 : x
  2. Step 2: Convert to fraction form
    685,978.30/1,029,006.33 = 212,730.94/x
  3. Step 3: Cross multiply
    685,978.30x = 1,029,006.33 × 212,730.94
  4. Step 4: Simplify right side
    685,978.30x = 218,901,483,846.85
  5. Step 5: Solve for x
    x = 218,901,483,846.85/685,978.30
  6. Step 6: Final answer
    x = 319,108.47

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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.