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Finding the Fourth Proportional to 426.21, 640.76 and 336.00

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Solution

The fourth proportional to 426.21, 640.76 and 336.00 is: 505.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.21 : 640.76 = 336.00 : x
  2. Step 2: Convert to fraction form
    426.21/640.76 = 336.00/x
  3. Step 3: Cross multiply
    426.21x = 640.76 × 336.00
  4. Step 4: Simplify right side
    426.21x = 215,294.37
  5. Step 5: Solve for x
    x = 215,294.37/426.21
  6. Step 6: Final answer
    x = 505.13

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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.