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Finding the Fourth Proportional to 639,692, 882,852.72 and 371,420

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Solution

The fourth proportional to 639,692, 882,852.72 and 371,420 is: 512,604.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,692 : 882,852.72 = 371,420 : x
  2. Step 2: Convert to fraction form
    639,692/882,852.72 = 371,420/x
  3. Step 3: Cross multiply
    639,692x = 882,852.72 × 371,420
  4. Step 4: Simplify right side
    639,692x = 327,909,157,262.40
  5. Step 5: Solve for x
    x = 327,909,157,262.40/639,692
  6. Step 6: Final answer
    x = 512,604.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.