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Finding the Fourth Proportional to 872.89, 1,315.34 and 722.21

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Solution

The fourth proportional to 872.89, 1,315.34 and 722.21 is: 1,088.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.89 : 1,315.34 = 722.21 : x
  2. Step 2: Convert to fraction form
    872.89/1,315.34 = 722.21/x
  3. Step 3: Cross multiply
    872.89x = 1,315.34 × 722.21
  4. Step 4: Simplify right side
    872.89x = 949,951.70
  5. Step 5: Solve for x
    x = 949,951.70/872.89
  6. Step 6: Final answer
    x = 1,088.28

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.