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Finding the Fourth Proportional to 785,724, 1,084,299.12 and 428,028

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Solution

The fourth proportional to 785,724, 1,084,299.12 and 428,028 is: 590,678.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    785,724 : 1,084,299.12 = 428,028 : x
  2. Step 2: Convert to fraction form
    785,724/1,084,299.12 = 428,028/x
  3. Step 3: Cross multiply
    785,724x = 1,084,299.12 × 428,028
  4. Step 4: Simplify right side
    785,724x = 464,110,383,735.36
  5. Step 5: Solve for x
    x = 464,110,383,735.36/785,724
  6. Step 6: Final answer
    x = 590,678.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.