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Finding the Fourth Proportional to 390.54, 586.02 and 253.85

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Solution

The fourth proportional to 390.54, 586.02 and 253.85 is: 380.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.54 : 586.02 = 253.85 : x
  2. Step 2: Convert to fraction form
    390.54/586.02 = 253.85/x
  3. Step 3: Cross multiply
    390.54x = 586.02 × 253.85
  4. Step 4: Simplify right side
    390.54x = 148,758.25
  5. Step 5: Solve for x
    x = 148,758.25/390.54
  6. Step 6: Final answer
    x = 380.90

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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.