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Finding the Fourth Proportional to 411.40, 616.60 and 167.80

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Solution

The fourth proportional to 411.40, 616.60 and 167.80 is: 251.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.40 : 616.60 = 167.80 : x
  2. Step 2: Convert to fraction form
    411.40/616.60 = 167.80/x
  3. Step 3: Cross multiply
    411.40x = 616.60 × 167.80
  4. Step 4: Simplify right side
    411.40x = 103,465.48
  5. Step 5: Solve for x
    x = 103,465.48/411.40
  6. Step 6: Final answer
    x = 251.50

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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.