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Finding the Fourth Proportional to 679,906.40, 1,020,005.40 and 206,639.60

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Solution

The fourth proportional to 679,906.40, 1,020,005.40 and 206,639.60 is: 310,003.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,906.40 : 1,020,005.40 = 206,639.60 : x
  2. Step 2: Convert to fraction form
    679,906.40/1,020,005.40 = 206,639.60/x
  3. Step 3: Cross multiply
    679,906.40x = 1,020,005.40 × 206,639.60
  4. Step 4: Simplify right side
    679,906.40x = 210,773,507,853.84
  5. Step 5: Solve for x
    x = 210,773,507,853.84/679,906.40
  6. Step 6: Final answer
    x = 310,003.71

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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.