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Finding the Fourth Proportional to 312,371.91, 431,071.20 and 169,131.51

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Solution

The fourth proportional to 312,371.91, 431,071.20 and 169,131.51 is: 233,400.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,371.91 : 431,071.20 = 169,131.51 : x
  2. Step 2: Convert to fraction form
    312,371.91/431,071.20 = 169,131.51/x
  3. Step 3: Cross multiply
    312,371.91x = 431,071.20 × 169,131.51
  4. Step 4: Simplify right side
    312,371.91x = 72,907,722,973.51
  5. Step 5: Solve for x
    x = 72,907,722,973.51/312,371.91
  6. Step 6: Final answer
    x = 233,400.38

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1.5x scale

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.