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Finding the Fourth Proportional to 673.11, 1,011.08 and 643.55

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Solution

The fourth proportional to 673.11, 1,011.08 and 643.55 is: 966.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.11 : 1,011.08 = 643.55 : x
  2. Step 2: Convert to fraction form
    673.11/1,011.08 = 643.55/x
  3. Step 3: Cross multiply
    673.11x = 1,011.08 × 643.55
  4. Step 4: Simplify right side
    673.11x = 650,677.09
  5. Step 5: Solve for x
    x = 650,677.09/673.11
  6. Step 6: Final answer
    x = 966.67

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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.