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Finding the Fourth Proportional to 1,214,917.60, 1,822,376.40 and 978,721.60

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Solution

The fourth proportional to 1,214,917.60, 1,822,376.40 and 978,721.60 is: 1,468,082.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214,917.60 : 1,822,376.40 = 978,721.60 : x
  2. Step 2: Convert to fraction form
    1,214,917.60/1,822,376.40 = 978,721.60/x
  3. Step 3: Cross multiply
    1,214,917.60x = 1,822,376.40 × 978,721.60
  4. Step 4: Simplify right side
    1,214,917.60x = 1,783,599,146,010.24
  5. Step 5: Solve for x
    x = 1,783,599,146,010.24/1,214,917.60
  6. Step 6: Final answer
    x = 1,468,082.40

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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.