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Finding the Fourth Proportional to 659,743.60, 989,615.40 and 393,804.40

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Solution

The fourth proportional to 659,743.60, 989,615.40 and 393,804.40 is: 590,706.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,743.60 : 989,615.40 = 393,804.40 : x
  2. Step 2: Convert to fraction form
    659,743.60/989,615.40 = 393,804.40/x
  3. Step 3: Cross multiply
    659,743.60x = 989,615.40 × 393,804.40
  4. Step 4: Simplify right side
    659,743.60x = 389,714,898,827.76
  5. Step 5: Solve for x
    x = 389,714,898,827.76/659,743.60
  6. Step 6: Final answer
    x = 590,706.60

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.