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Finding the Fourth Proportional to 411.72, 617.58 and 155.28

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Solution

The fourth proportional to 411.72, 617.58 and 155.28 is: 232.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.72 : 617.58 = 155.28 : x
  2. Step 2: Convert to fraction form
    411.72/617.58 = 155.28/x
  3. Step 3: Cross multiply
    411.72x = 617.58 × 155.28
  4. Step 4: Simplify right side
    411.72x = 95,897.82
  5. Step 5: Solve for x
    x = 95,897.82/411.72
  6. Step 6: Final answer
    x = 232.92

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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.