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Finding the Fourth Proportional to 430.53, 645.80 and 426.28

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Solution

The fourth proportional to 430.53, 645.80 and 426.28 is: 639.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.53 : 645.80 = 426.28 : x
  2. Step 2: Convert to fraction form
    430.53/645.80 = 426.28/x
  3. Step 3: Cross multiply
    430.53x = 645.80 × 426.28
  4. Step 4: Simplify right side
    430.53x = 275,291.62
  5. Step 5: Solve for x
    x = 275,291.62/430.53
  6. Step 6: Final answer
    x = 639.42

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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.