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Finding the Fourth Proportional to 491.28, 678.60 and 426.96

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Solution

The fourth proportional to 491.28, 678.60 and 426.96 is: 589.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.28 : 678.60 = 426.96 : x
  2. Step 2: Convert to fraction form
    491.28/678.60 = 426.96/x
  3. Step 3: Cross multiply
    491.28x = 678.60 × 426.96
  4. Step 4: Simplify right side
    491.28x = 289,735.06
  5. Step 5: Solve for x
    x = 289,735.06/491.28
  6. Step 6: Final answer
    x = 589.76

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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.