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Finding the Fourth Proportional to 208,060.40, 312,090.60 and 205,986.80

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Solution

The fourth proportional to 208,060.40, 312,090.60 and 205,986.80 is: 308,980.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,060.40 : 312,090.60 = 205,986.80 : x
  2. Step 2: Convert to fraction form
    208,060.40/312,090.60 = 205,986.80/x
  3. Step 3: Cross multiply
    208,060.40x = 312,090.60 × 205,986.80
  4. Step 4: Simplify right side
    208,060.40x = 64,286,544,004.08
  5. Step 5: Solve for x
    x = 64,286,544,004.08/208,060.40
  6. Step 6: Final answer
    x = 308,980.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.