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Finding the Fourth Proportional to 310,680.65, 428,741.79 and 172,861.58

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Solution

The fourth proportional to 310,680.65, 428,741.79 and 172,861.58 is: 238,550.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,680.65 : 428,741.79 = 172,861.58 : x
  2. Step 2: Convert to fraction form
    310,680.65/428,741.79 = 172,861.58/x
  3. Step 3: Cross multiply
    310,680.65x = 428,741.79 × 172,861.58
  4. Step 4: Simplify right side
    310,680.65x = 74,112,983,231.43
  5. Step 5: Solve for x
    x = 74,112,983,231.43/310,680.65
  6. Step 6: Final answer
    x = 238,550.37

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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.