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Finding the Fourth Proportional to 423.87, 635.79 and 391.07

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Solution

The fourth proportional to 423.87, 635.79 and 391.07 is: 586.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.87 : 635.79 = 391.07 : x
  2. Step 2: Convert to fraction form
    423.87/635.79 = 391.07/x
  3. Step 3: Cross multiply
    423.87x = 635.79 × 391.07
  4. Step 4: Simplify right side
    423.87x = 248,635.22
  5. Step 5: Solve for x
    x = 248,635.22/423.87
  6. Step 6: Final answer
    x = 586.58

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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.