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Finding the Fourth Proportional to 390.96, 586.26 and 253.44

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Solution

The fourth proportional to 390.96, 586.26 and 253.44 is: 380.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.96 : 586.26 = 253.44 : x
  2. Step 2: Convert to fraction form
    390.96/586.26 = 253.44/x
  3. Step 3: Cross multiply
    390.96x = 586.26 × 253.44
  4. Step 4: Simplify right side
    390.96x = 148,581.73
  5. Step 5: Solve for x
    x = 148,581.73/390.96
  6. Step 6: Final answer
    x = 380.04

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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.