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Finding the Fourth Proportional to 485.28, 668.16 and 420.48

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Solution

The fourth proportional to 485.28, 668.16 and 420.48 is: 578.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.28 : 668.16 = 420.48 : x
  2. Step 2: Convert to fraction form
    485.28/668.16 = 420.48/x
  3. Step 3: Cross multiply
    485.28x = 668.16 × 420.48
  4. Step 4: Simplify right side
    485.28x = 280,947.92
  5. Step 5: Solve for x
    x = 280,947.92/485.28
  6. Step 6: Final answer
    x = 578.94

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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.