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Finding the Fourth Proportional to 386.68, 580.15 and 155.62

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Solution

The fourth proportional to 386.68, 580.15 and 155.62 is: 233.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.68 : 580.15 = 155.62 : x
  2. Step 2: Convert to fraction form
    386.68/580.15 = 155.62/x
  3. Step 3: Cross multiply
    386.68x = 580.15 × 155.62
  4. Step 4: Simplify right side
    386.68x = 90,282.94
  5. Step 5: Solve for x
    x = 90,282.94/386.68
  6. Step 6: Final answer
    x = 233.48

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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.