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Finding the Fourth Proportional to 911.95, 1,367.94 and 424.87

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Solution

The fourth proportional to 911.95, 1,367.94 and 424.87 is: 637.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.95 : 1,367.94 = 424.87 : x
  2. Step 2: Convert to fraction form
    911.95/1,367.94 = 424.87/x
  3. Step 3: Cross multiply
    911.95x = 1,367.94 × 424.87
  4. Step 4: Simplify right side
    911.95x = 581,196.67
  5. Step 5: Solve for x
    x = 581,196.67/911.95
  6. Step 6: Final answer
    x = 637.31

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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.