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Finding the Fourth Proportional to 480.96, 721.44 and 390.24

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Solution

The fourth proportional to 480.96, 721.44 and 390.24 is: 585.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.96 : 721.44 = 390.24 : x
  2. Step 2: Convert to fraction form
    480.96/721.44 = 390.24/x
  3. Step 3: Cross multiply
    480.96x = 721.44 × 390.24
  4. Step 4: Simplify right side
    480.96x = 281,534.75
  5. Step 5: Solve for x
    x = 281,534.75/480.96
  6. Step 6: Final answer
    x = 585.36

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Why These Related Problems?

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