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Finding the Fourth Proportional to 871.45, 1,307.18 and 323.73

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Solution

The fourth proportional to 871.45, 1,307.18 and 323.73 is: 485.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.45 : 1,307.18 = 323.73 : x
  2. Step 2: Convert to fraction form
    871.45/1,307.18 = 323.73/x
  3. Step 3: Cross multiply
    871.45x = 1,307.18 × 323.73
  4. Step 4: Simplify right side
    871.45x = 423,171.76
  5. Step 5: Solve for x
    x = 423,171.76/871.45
  6. Step 6: Final answer
    x = 485.60

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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.