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Finding the Fourth Proportional to 665,495.40, 998,243.10 and 647,999.40

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Solution

The fourth proportional to 665,495.40, 998,243.10 and 647,999.40 is: 971,999.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,495.40 : 998,243.10 = 647,999.40 : x
  2. Step 2: Convert to fraction form
    665,495.40/998,243.10 = 647,999.40/x
  3. Step 3: Cross multiply
    665,495.40x = 998,243.10 × 647,999.40
  4. Step 4: Simplify right side
    665,495.40x = 646,860,929,854.14
  5. Step 5: Solve for x
    x = 646,860,929,854.14/665,495.40
  6. Step 6: Final answer
    x = 971,999.10

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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.