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Finding the Fourth Proportional to 656.54, 905.72 and 420.37

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Solution

The fourth proportional to 656.54, 905.72 and 420.37 is: 579.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.54 : 905.72 = 420.37 : x
  2. Step 2: Convert to fraction form
    656.54/905.72 = 420.37/x
  3. Step 3: Cross multiply
    656.54x = 905.72 × 420.37
  4. Step 4: Simplify right side
    656.54x = 380,735.41
  5. Step 5: Solve for x
    x = 380,735.41/656.54
  6. Step 6: Final answer
    x = 579.92

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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.