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Finding the Fourth Proportional to 1,310,784.60, 1,966,241.70 and 680,928.60

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Solution

The fourth proportional to 1,310,784.60, 1,966,241.70 and 680,928.60 is: 1,021,426.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310,784.60 : 1,966,241.70 = 680,928.60 : x
  2. Step 2: Convert to fraction form
    1,310,784.60/1,966,241.70 = 680,928.60/x
  3. Step 3: Cross multiply
    1,310,784.60x = 1,966,241.70 × 680,928.60
  4. Step 4: Simplify right side
    1,310,784.60x = 1,338,870,208,042.62
  5. Step 5: Solve for x
    x = 1,338,870,208,042.62/1,310,784.60
  6. Step 6: Final answer
    x = 1,021,426.56

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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.