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Finding the Fourth Proportional to 383.93, 530.03 and 308.42

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Solution

The fourth proportional to 383.93, 530.03 and 308.42 is: 425.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.93 : 530.03 = 308.42 : x
  2. Step 2: Convert to fraction form
    383.93/530.03 = 308.42/x
  3. Step 3: Cross multiply
    383.93x = 530.03 × 308.42
  4. Step 4: Simplify right side
    383.93x = 163,471.85
  5. Step 5: Solve for x
    x = 163,471.85/383.93
  6. Step 6: Final answer
    x = 425.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.