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Finding the Fourth Proportional to 312,485.90, 431,111.63 and 231,009.80

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Solution

The fourth proportional to 312,485.90, 431,111.63 and 231,009.80 is: 318,705.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,485.90 : 431,111.63 = 231,009.80 : x
  2. Step 2: Convert to fraction form
    312,485.90/431,111.63 = 231,009.80/x
  3. Step 3: Cross multiply
    312,485.90x = 431,111.63 × 231,009.80
  4. Step 4: Simplify right side
    312,485.90x = 99,591,009,845.94
  5. Step 5: Solve for x
    x = 99,591,009,845.94/312,485.90
  6. Step 6: Final answer
    x = 318,705.62

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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.