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Finding the Fourth Proportional to 665,911.60, 998,940.30 and 644,916.40

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Solution

The fourth proportional to 665,911.60, 998,940.30 and 644,916.40 is: 967,445.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,911.60 : 998,940.30 = 644,916.40 : x
  2. Step 2: Convert to fraction form
    665,911.60/998,940.30 = 644,916.40/x
  3. Step 3: Cross multiply
    665,911.60x = 998,940.30 × 644,916.40
  4. Step 4: Simplify right side
    665,911.60x = 644,232,982,090.92
  5. Step 5: Solve for x
    x = 644,232,982,090.92/665,911.60
  6. Step 6: Final answer
    x = 967,445.20

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