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Finding the Fourth Proportional to 312,128.98, 430,736.61 and 168,891.55

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Solution

The fourth proportional to 312,128.98, 430,736.61 and 168,891.55 is: 233,069.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,128.98 : 430,736.61 = 168,891.55 : x
  2. Step 2: Convert to fraction form
    312,128.98/430,736.61 = 168,891.55/x
  3. Step 3: Cross multiply
    312,128.98x = 430,736.61 × 168,891.55
  4. Step 4: Simplify right side
    312,128.98x = 72,747,773,704.65
  5. Step 5: Solve for x
    x = 72,747,773,704.65/312,128.98
  6. Step 6: Final answer
    x = 233,069.59

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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.