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Finding the Fourth Proportional to 871.79, 1,307.81 and 255.42

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Solution

The fourth proportional to 871.79, 1,307.81 and 255.42 is: 383.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.79 : 1,307.81 = 255.42 : x
  2. Step 2: Convert to fraction form
    871.79/1,307.81 = 255.42/x
  3. Step 3: Cross multiply
    871.79x = 1,307.81 × 255.42
  4. Step 4: Simplify right side
    871.79x = 334,033.01
  5. Step 5: Solve for x
    x = 334,033.01/871.79
  6. Step 6: Final answer
    x = 383.16

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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.