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Finding the Fourth Proportional to 679,908.40, 1,020,008.40 and 206,641.60

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Solution

The fourth proportional to 679,908.40, 1,020,008.40 and 206,641.60 is: 310,006.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,908.40 : 1,020,008.40 = 206,641.60 : x
  2. Step 2: Convert to fraction form
    679,908.40/1,020,008.40 = 206,641.60/x
  3. Step 3: Cross multiply
    679,908.40x = 1,020,008.40 × 206,641.60
  4. Step 4: Simplify right side
    679,908.40x = 210,776,167,789.44
  5. Step 5: Solve for x
    x = 210,776,167,789.44/679,908.40
  6. Step 6: Final answer
    x = 310,006.71

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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.