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Finding the Fourth Proportional to 722.89, 1,085.55 and 717.22

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Solution

The fourth proportional to 722.89, 1,085.55 and 717.22 is: 1,077.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.89 : 1,085.55 = 717.22 : x
  2. Step 2: Convert to fraction form
    722.89/1,085.55 = 717.22/x
  3. Step 3: Cross multiply
    722.89x = 1,085.55 × 717.22
  4. Step 4: Simplify right side
    722.89x = 778,578.17
  5. Step 5: Solve for x
    x = 778,578.17/722.89
  6. Step 6: Final answer
    x = 1,077.04

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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.