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Finding the Fourth Proportional to 642,820.92, 964,239.59 and 443,087.68

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Solution

The fourth proportional to 642,820.92, 964,239.59 and 443,087.68 is: 664,637.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,820.92 : 964,239.59 = 443,087.68 : x
  2. Step 2: Convert to fraction form
    642,820.92/964,239.59 = 443,087.68/x
  3. Step 3: Cross multiply
    642,820.92x = 964,239.59 × 443,087.68
  4. Step 4: Simplify right side
    642,820.92x = 427,242,682,897.25
  5. Step 5: Solve for x
    x = 427,242,682,897.25/642,820.92
  6. Step 6: Final answer
    x = 664,637.18

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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.