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Finding the Fourth Proportional to 642,742.11, 964,791.12 and 628,265.67

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Solution

The fourth proportional to 642,742.11, 964,791.12 and 628,265.67 is: 943,061.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,742.11 : 964,791.12 = 628,265.67 : x
  2. Step 2: Convert to fraction form
    642,742.11/964,791.12 = 628,265.67/x
  3. Step 3: Cross multiply
    642,742.11x = 964,791.12 × 628,265.67
  4. Step 4: Simplify right side
    642,742.11x = 606,145,139,416.85
  5. Step 5: Solve for x
    x = 606,145,139,416.85/642,742.11
  6. Step 6: Final answer
    x = 943,061.19

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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.