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Finding the Fourth Proportional to 642,871.36, 964,314.96 and 443,138.02

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Solution

The fourth proportional to 642,871.36, 964,314.96 and 443,138.02 is: 664,712.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,871.36 : 964,314.96 = 443,138.02 : x
  2. Step 2: Convert to fraction form
    642,871.36/964,314.96 = 443,138.02/x
  3. Step 3: Cross multiply
    642,871.36x = 964,314.96 × 443,138.02
  4. Step 4: Simplify right side
    642,871.36x = 427,324,622,030.78
  5. Step 5: Solve for x
    x = 427,324,622,030.78/642,871.36
  6. Step 6: Final answer
    x = 664,712.49

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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.