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Finding the Fourth Proportional to 386.48, 579.69 and 155.46

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Solution

The fourth proportional to 386.48, 579.69 and 155.46 is: 233.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.48 : 579.69 = 155.46 : x
  2. Step 2: Convert to fraction form
    386.48/579.69 = 155.46/x
  3. Step 3: Cross multiply
    386.48x = 579.69 × 155.46
  4. Step 4: Simplify right side
    386.48x = 90,118.61
  5. Step 5: Solve for x
    x = 90,118.61/386.48
  6. Step 6: Final answer
    x = 233.18

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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.