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Finding the Fourth Proportional to 661,308.98, 911,749.81 and 428,321.39

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Solution

The fourth proportional to 661,308.98, 911,749.81 and 428,321.39 is: 590,528.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,308.98 : 911,749.81 = 428,321.39 : x
  2. Step 2: Convert to fraction form
    661,308.98/911,749.81 = 428,321.39/x
  3. Step 3: Cross multiply
    661,308.98x = 911,749.81 × 428,321.39
  4. Step 4: Simplify right side
    661,308.98x = 390,521,945,951.44
  5. Step 5: Solve for x
    x = 390,521,945,951.44/661,308.98
  6. Step 6: Final answer
    x = 590,528.72

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1.5x scale

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.