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Finding the Fourth Proportional to 872.94, 1,307.35 and 689.11

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Solution

The fourth proportional to 872.94, 1,307.35 and 689.11 is: 1,032.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.94 : 1,307.35 = 689.11 : x
  2. Step 2: Convert to fraction form
    872.94/1,307.35 = 689.11/x
  3. Step 3: Cross multiply
    872.94x = 1,307.35 × 689.11
  4. Step 4: Simplify right side
    872.94x = 900,907.96
  5. Step 5: Solve for x
    x = 900,907.96/872.94
  6. Step 6: Final answer
    x = 1,032.04

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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.