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Finding the Fourth Proportional to 411.36, 616.28 and 257.20

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Solution

The fourth proportional to 411.36, 616.28 and 257.20 is: 385.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.36 : 616.28 = 257.20 : x
  2. Step 2: Convert to fraction form
    411.36/616.28 = 257.20/x
  3. Step 3: Cross multiply
    411.36x = 616.28 × 257.20
  4. Step 4: Simplify right side
    411.36x = 158,507.22
  5. Step 5: Solve for x
    x = 158,507.22/411.36
  6. Step 6: Final answer
    x = 385.32

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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.