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Finding the Fourth Proportional to 430.66, 646.41 and 225.55

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Solution

The fourth proportional to 430.66, 646.41 and 225.55 is: 338.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.66 : 646.41 = 225.55 : x
  2. Step 2: Convert to fraction form
    430.66/646.41 = 225.55/x
  3. Step 3: Cross multiply
    430.66x = 646.41 × 225.55
  4. Step 4: Simplify right side
    430.66x = 145,797.78
  5. Step 5: Solve for x
    x = 145,797.78/430.66
  6. Step 6: Final answer
    x = 338.54

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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.