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Finding the Fourth Proportional to 871.38, 1,307.40 and 323.94

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Solution

The fourth proportional to 871.38, 1,307.40 and 323.94 is: 486.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.38 : 1,307.40 = 323.94 : x
  2. Step 2: Convert to fraction form
    871.38/1,307.40 = 323.94/x
  3. Step 3: Cross multiply
    871.38x = 1,307.40 × 323.94
  4. Step 4: Simplify right side
    871.38x = 423,519.16
  5. Step 5: Solve for x
    x = 423,519.16/871.38
  6. Step 6: Final answer
    x = 486.03

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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.