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Finding the Fourth Proportional to 978,280.70, 1,372,081.30 and 978,280.70

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Solution

The fourth proportional to 978,280.70, 1,372,081.30 and 978,280.70 is: 1,372,081.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,280.70 : 1,372,081.30 = 978,280.70 : x
  2. Step 2: Convert to fraction form
    978,280.70/1,372,081.30 = 978,280.70/x
  3. Step 3: Cross multiply
    978,280.70x = 1,372,081.30 × 978,280.70
  4. Step 4: Simplify right side
    978,280.70x = 1,342,280,654,620.91
  5. Step 5: Solve for x
    x = 1,342,280,654,620.91/978,280.70
  6. Step 6: Final answer
    x = 1,372,081.30

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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.