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Finding the Fourth Proportional to 715,500.81, 987,408.23 and 393,241.50

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Solution

The fourth proportional to 715,500.81, 987,408.23 and 393,241.50 is: 542,682.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,500.81 : 987,408.23 = 393,241.50 : x
  2. Step 2: Convert to fraction form
    715,500.81/987,408.23 = 393,241.50/x
  3. Step 3: Cross multiply
    715,500.81x = 987,408.23 × 393,241.50
  4. Step 4: Simplify right side
    715,500.81x = 388,289,891,511.34
  5. Step 5: Solve for x
    x = 388,289,891,511.34/715,500.81
  6. Step 6: Final answer
    x = 542,682.67

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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.