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Finding the Fourth Proportional to 386.69, 579.94 and 155.63

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Solution

The fourth proportional to 386.69, 579.94 and 155.63 is: 233.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.69 : 579.94 = 155.63 : x
  2. Step 2: Convert to fraction form
    386.69/579.94 = 155.63/x
  3. Step 3: Cross multiply
    386.69x = 579.94 × 155.63
  4. Step 4: Simplify right side
    386.69x = 90,256.06
  5. Step 5: Solve for x
    x = 90,256.06/386.69
  6. Step 6: Final answer
    x = 233.41

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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.