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Finding the Fourth Proportional to 872.88, 1,309.50 and 461.79

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Solution

The fourth proportional to 872.88, 1,309.50 and 461.79 is: 692.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.88 : 1,309.50 = 461.79 : x
  2. Step 2: Convert to fraction form
    872.88/1,309.50 = 461.79/x
  3. Step 3: Cross multiply
    872.88x = 1,309.50 × 461.79
  4. Step 4: Simplify right side
    872.88x = 604,714.01
  5. Step 5: Solve for x
    x = 604,714.01/872.88
  6. Step 6: Final answer
    x = 692.78

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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.