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Finding the Fourth Proportional to 871.70, 1,307.75 and 323.87

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Solution

The fourth proportional to 871.70, 1,307.75 and 323.87 is: 485.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.70 : 1,307.75 = 323.87 : x
  2. Step 2: Convert to fraction form
    871.70/1,307.75 = 323.87/x
  3. Step 3: Cross multiply
    871.70x = 1,307.75 × 323.87
  4. Step 4: Simplify right side
    871.70x = 423,532.83
  5. Step 5: Solve for x
    x = 423,532.83/871.70
  6. Step 6: Final answer
    x = 485.87

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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.