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Finding the Fourth Proportional to 978,160.20, 1,371,912.60 and 978,160.20

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Solution

The fourth proportional to 978,160.20, 1,371,912.60 and 978,160.20 is: 1,371,912.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,160.20 : 1,371,912.60 = 978,160.20 : x
  2. Step 2: Convert to fraction form
    978,160.20/1,371,912.60 = 978,160.20/x
  3. Step 3: Cross multiply
    978,160.20x = 1,371,912.60 × 978,160.20
  4. Step 4: Simplify right side
    978,160.20x = 1,341,950,303,198.52
  5. Step 5: Solve for x
    x = 1,341,950,303,198.52/978,160.20
  6. Step 6: Final answer
    x = 1,371,912.60

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.