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Finding the Fourth Proportional to 912.67, 1,369.10 and 450.77

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Solution

The fourth proportional to 912.67, 1,369.10 and 450.77 is: 676.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.67 : 1,369.10 = 450.77 : x
  2. Step 2: Convert to fraction form
    912.67/1,369.10 = 450.77/x
  3. Step 3: Cross multiply
    912.67x = 1,369.10 × 450.77
  4. Step 4: Simplify right side
    912.67x = 617,143.49
  5. Step 5: Solve for x
    x = 617,143.49/912.67
  6. Step 6: Final answer
    x = 676.20

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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.