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Finding the Fourth Proportional to 996,216, 1,374,778.40 and 638,520

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Solution

The fourth proportional to 996,216, 1,374,778.40 and 638,520 is: 881,157.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    996,216 : 1,374,778.40 = 638,520 : x
  2. Step 2: Convert to fraction form
    996,216/1,374,778.40 = 638,520/x
  3. Step 3: Cross multiply
    996,216x = 1,374,778.40 × 638,520
  4. Step 4: Simplify right side
    996,216x = 877,823,503,968
  5. Step 5: Solve for x
    x = 877,823,503,968/996,216
  6. Step 6: Final answer
    x = 881,157.81

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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.