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Finding the Fourth Proportional to 656,818.76, 906,409.89 and 355,012.76

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Solution

The fourth proportional to 656,818.76, 906,409.89 and 355,012.76 is: 489,917.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,818.76 : 906,409.89 = 355,012.76 : x
  2. Step 2: Convert to fraction form
    656,818.76/906,409.89 = 355,012.76/x
  3. Step 3: Cross multiply
    656,818.76x = 906,409.89 × 355,012.76
  4. Step 4: Simplify right side
    656,818.76x = 321,787,076,740.20
  5. Step 5: Solve for x
    x = 321,787,076,740.20/656,818.76
  6. Step 6: Final answer
    x = 489,917.61

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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.