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Finding the Fourth Proportional to 490,615.60, 685,287.20 and 490,615.60

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Solution

The fourth proportional to 490,615.60, 685,287.20 and 490,615.60 is: 685,287.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,615.60 : 685,287.20 = 490,615.60 : x
  2. Step 2: Convert to fraction form
    490,615.60/685,287.20 = 490,615.60/x
  3. Step 3: Cross multiply
    490,615.60x = 685,287.20 × 490,615.60
  4. Step 4: Simplify right side
    490,615.60x = 336,212,590,800.32
  5. Step 5: Solve for x
    x = 336,212,590,800.32/490,615.60
  6. Step 6: Final answer
    x = 685,287.20

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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.