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Finding the Fourth Proportional to 430.03, 648.56 and 425.44

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Solution

The fourth proportional to 430.03, 648.56 and 425.44 is: 641.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.03 : 648.56 = 425.44 : x
  2. Step 2: Convert to fraction form
    430.03/648.56 = 425.44/x
  3. Step 3: Cross multiply
    430.03x = 648.56 × 425.44
  4. Step 4: Simplify right side
    430.03x = 275,923.37
  5. Step 5: Solve for x
    x = 275,923.37/430.03
  6. Step 6: Final answer
    x = 641.64

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.