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Finding the Fourth Proportional to 391.99, 587.68 and 253.02

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Solution

The fourth proportional to 391.99, 587.68 and 253.02 is: 379.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.99 : 587.68 = 253.02 : x
  2. Step 2: Convert to fraction form
    391.99/587.68 = 253.02/x
  3. Step 3: Cross multiply
    391.99x = 587.68 × 253.02
  4. Step 4: Simplify right side
    391.99x = 148,697.08
  5. Step 5: Solve for x
    x = 148,697.08/391.99
  6. Step 6: Final answer
    x = 379.34

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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.