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Finding the Fourth Proportional to 317,930.39, 438,751.83 and 172,736.21

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Solution

The fourth proportional to 317,930.39, 438,751.83 and 172,736.21 is: 238,380.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,930.39 : 438,751.83 = 172,736.21 : x
  2. Step 2: Convert to fraction form
    317,930.39/438,751.83 = 172,736.21/x
  3. Step 3: Cross multiply
    317,930.39x = 438,751.83 × 172,736.21
  4. Step 4: Simplify right side
    317,930.39x = 75,788,326,051.01
  5. Step 5: Solve for x
    x = 75,788,326,051.01/317,930.39
  6. Step 6: Final answer
    x = 238,380.25

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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.