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Finding the Fourth Proportional to 478.56, 660.37 and 439.34

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Solution

The fourth proportional to 478.56, 660.37 and 439.34 is: 606.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.56 : 660.37 = 439.34 : x
  2. Step 2: Convert to fraction form
    478.56/660.37 = 439.34/x
  3. Step 3: Cross multiply
    478.56x = 660.37 × 439.34
  4. Step 4: Simplify right side
    478.56x = 290,132.20
  5. Step 5: Solve for x
    x = 290,132.20/478.56
  6. Step 6: Final answer
    x = 606.26

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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.