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Finding the Fourth Proportional to 620,873.92, 857,456.51 and 427,783.69

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Solution

The fourth proportional to 620,873.92, 857,456.51 and 427,783.69 is: 590,789.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,873.92 : 857,456.51 = 427,783.69 : x
  2. Step 2: Convert to fraction form
    620,873.92/857,456.51 = 427,783.69/x
  3. Step 3: Cross multiply
    620,873.92x = 857,456.51 × 427,783.69
  4. Step 4: Simplify right side
    620,873.92x = 366,805,909,862.32
  5. Step 5: Solve for x
    x = 366,805,909,862.32/620,873.92
  6. Step 6: Final answer
    x = 590,789.69

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Double scale
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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.