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Finding the Fourth Proportional to 386.93, 580.25 and 155.76

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Solution

The fourth proportional to 386.93, 580.25 and 155.76 is: 233.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.93 : 580.25 = 155.76 : x
  2. Step 2: Convert to fraction form
    386.93/580.25 = 155.76/x
  3. Step 3: Cross multiply
    386.93x = 580.25 × 155.76
  4. Step 4: Simplify right side
    386.93x = 90,377.08
  5. Step 5: Solve for x
    x = 90,377.08/386.93
  6. Step 6: Final answer
    x = 233.58

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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.