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Finding the Fourth Proportional to 478.56, 660.36 and 271.56

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Solution

The fourth proportional to 478.56, 660.36 and 271.56 is: 374.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.56 : 660.36 = 271.56 : x
  2. Step 2: Convert to fraction form
    478.56/660.36 = 271.56/x
  3. Step 3: Cross multiply
    478.56x = 660.36 × 271.56
  4. Step 4: Simplify right side
    478.56x = 179,327.36
  5. Step 5: Solve for x
    x = 179,327.36/478.56
  6. Step 6: Final answer
    x = 374.72

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.