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Finding the Fourth Proportional to 872.78, 1,309.16 and 352.76

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Solution

The fourth proportional to 872.78, 1,309.16 and 352.76 is: 529.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.78 : 1,309.16 = 352.76 : x
  2. Step 2: Convert to fraction form
    872.78/1,309.16 = 352.76/x
  3. Step 3: Cross multiply
    872.78x = 1,309.16 × 352.76
  4. Step 4: Simplify right side
    872.78x = 461,813.62
  5. Step 5: Solve for x
    x = 461,813.62/872.78
  6. Step 6: Final answer
    x = 529.13

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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.