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Finding the Fourth Proportional to 917.34, 1,265.94 and 722.31

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Solution

The fourth proportional to 917.34, 1,265.94 and 722.31 is: 996.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.34 : 1,265.94 = 722.31 : x
  2. Step 2: Convert to fraction form
    917.34/1,265.94 = 722.31/x
  3. Step 3: Cross multiply
    917.34x = 1,265.94 × 722.31
  4. Step 4: Simplify right side
    917.34x = 914,401.12
  5. Step 5: Solve for x
    x = 914,401.12/917.34
  6. Step 6: Final answer
    x = 996.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.