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Finding the Fourth Proportional to 872.79, 1,309.05 and 352.66

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Solution

The fourth proportional to 872.79, 1,309.05 and 352.66 is: 528.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.79 : 1,309.05 = 352.66 : x
  2. Step 2: Convert to fraction form
    872.79/1,309.05 = 352.66/x
  3. Step 3: Cross multiply
    872.79x = 1,309.05 × 352.66
  4. Step 4: Simplify right side
    872.79x = 461,648.75
  5. Step 5: Solve for x
    x = 461,648.75/872.79
  6. Step 6: Final answer
    x = 528.93

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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.