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Finding the Fourth Proportional to 911.45, 1,368.09 and 424.85

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Solution

The fourth proportional to 911.45, 1,368.09 and 424.85 is: 637.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.45 : 1,368.09 = 424.85 : x
  2. Step 2: Convert to fraction form
    911.45/1,368.09 = 424.85/x
  3. Step 3: Cross multiply
    911.45x = 1,368.09 × 424.85
  4. Step 4: Simplify right side
    911.45x = 581,226.20
  5. Step 5: Solve for x
    x = 581,226.20/911.45
  6. Step 6: Final answer
    x = 637.69

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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.