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Finding the Fourth Proportional to 872.17, 1,307.74 and 352.42

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Solution

The fourth proportional to 872.17, 1,307.74 and 352.42 is: 528.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.17 : 1,307.74 = 352.42 : x
  2. Step 2: Convert to fraction form
    872.17/1,307.74 = 352.42/x
  3. Step 3: Cross multiply
    872.17x = 1,307.74 × 352.42
  4. Step 4: Simplify right side
    872.17x = 460,873.73
  5. Step 5: Solve for x
    x = 460,873.73/872.17
  6. Step 6: Final answer
    x = 528.42

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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.