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Finding the Fourth Proportional to 411.51, 617.36 and 137.58

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Solution

The fourth proportional to 411.51, 617.36 and 137.58 is: 206.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.51 : 617.36 = 137.58 : x
  2. Step 2: Convert to fraction form
    411.51/617.36 = 137.58/x
  3. Step 3: Cross multiply
    411.51x = 617.36 × 137.58
  4. Step 4: Simplify right side
    411.51x = 84,935.70
  5. Step 5: Solve for x
    x = 84,935.70/411.51
  6. Step 6: Final answer
    x = 206.40

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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.