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Finding the Fourth Proportional to 480.72, 722.76 and 385.20

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Solution

The fourth proportional to 480.72, 722.76 and 385.20 is: 579.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.72 : 722.76 = 385.20 : x
  2. Step 2: Convert to fraction form
    480.72/722.76 = 385.20/x
  3. Step 3: Cross multiply
    480.72x = 722.76 × 385.20
  4. Step 4: Simplify right side
    480.72x = 278,407.15
  5. Step 5: Solve for x
    x = 278,407.15/480.72
  6. Step 6: Final answer
    x = 579.15

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.