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Finding the Fourth Proportional to 383.12, 571.05 and 355.42

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Solution

The fourth proportional to 383.12, 571.05 and 355.42 is: 529.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.12 : 571.05 = 355.42 : x
  2. Step 2: Convert to fraction form
    383.12/571.05 = 355.42/x
  3. Step 3: Cross multiply
    383.12x = 571.05 × 355.42
  4. Step 4: Simplify right side
    383.12x = 202,960.81
  5. Step 5: Solve for x
    x = 202,960.81/383.12
  6. Step 6: Final answer
    x = 529.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.