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Finding the Fourth Proportional to 411.68, 617.64 and 123.14

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Solution

The fourth proportional to 411.68, 617.64 and 123.14 is: 184.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.68 : 617.64 = 123.14 : x
  2. Step 2: Convert to fraction form
    411.68/617.64 = 123.14/x
  3. Step 3: Cross multiply
    411.68x = 617.64 × 123.14
  4. Step 4: Simplify right side
    411.68x = 76,056.19
  5. Step 5: Solve for x
    x = 76,056.19/411.68
  6. Step 6: Final answer
    x = 184.75

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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.