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Finding the Fourth Proportional to 715,989.21, 987,819.23 and 443,959.21

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Solution

The fourth proportional to 715,989.21, 987,819.23 and 443,959.21 is: 612,511.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,989.21 : 987,819.23 = 443,959.21 : x
  2. Step 2: Convert to fraction form
    715,989.21/987,819.23 = 443,959.21/x
  3. Step 3: Cross multiply
    715,989.21x = 987,819.23 × 443,959.21
  4. Step 4: Simplify right side
    715,989.21x = 438,551,447,318.28
  5. Step 5: Solve for x
    x = 438,551,447,318.28/715,989.21
  6. Step 6: Final answer
    x = 612,511.26

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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.