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Finding the Fourth Proportional to 878,705.80, 1,317,021.90 and 656,830.60

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Solution

The fourth proportional to 878,705.80, 1,317,021.90 and 656,830.60 is: 984,470.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,705.80 : 1,317,021.90 = 656,830.60 : x
  2. Step 2: Convert to fraction form
    878,705.80/1,317,021.90 = 656,830.60/x
  3. Step 3: Cross multiply
    878,705.80x = 1,317,021.90 × 656,830.60
  4. Step 4: Simplify right side
    878,705.80x = 865,060,284,790.14
  5. Step 5: Solve for x
    x = 865,060,284,790.14/878,705.80
  6. Step 6: Final answer
    x = 984,470.89

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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.