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Finding the Fourth Proportional to 661,804.60, 991,535.70 and 639,878.20

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Solution

The fourth proportional to 661,804.60, 991,535.70 and 639,878.20 is: 958,684.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,804.60 : 991,535.70 = 639,878.20 : x
  2. Step 2: Convert to fraction form
    661,804.60/991,535.70 = 639,878.20/x
  3. Step 3: Cross multiply
    661,804.60x = 991,535.70 × 639,878.20
  4. Step 4: Simplify right side
    661,804.60x = 634,462,078,951.74
  5. Step 5: Solve for x
    x = 634,462,078,951.74/661,804.60
  6. Step 6: Final answer
    x = 958,684.90

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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.