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Finding the Fourth Proportional to 915,721.20, 1,369,693.80 and 821,631.60

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Solution

The fourth proportional to 915,721.20, 1,369,693.80 and 821,631.60 is: 1,228,958.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    915,721.20 : 1,369,693.80 = 821,631.60 : x
  2. Step 2: Convert to fraction form
    915,721.20/1,369,693.80 = 821,631.60/x
  3. Step 3: Cross multiply
    915,721.20x = 1,369,693.80 × 821,631.60
  4. Step 4: Simplify right side
    915,721.20x = 1,125,383,708,404.08
  5. Step 5: Solve for x
    x = 1,125,383,708,404.08/915,721.20
  6. Step 6: Final answer
    x = 1,228,958.89

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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.