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Finding the Fourth Proportional to 480.13, 721.01 and 428.16

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Solution

The fourth proportional to 480.13, 721.01 and 428.16 is: 642.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.13 : 721.01 = 428.16 : x
  2. Step 2: Convert to fraction form
    480.13/721.01 = 428.16/x
  3. Step 3: Cross multiply
    480.13x = 721.01 × 428.16
  4. Step 4: Simplify right side
    480.13x = 308,707.64
  5. Step 5: Solve for x
    x = 308,707.64/480.13
  6. Step 6: Final answer
    x = 642.97

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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.