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Finding the Fourth Proportional to 386.81, 579.98 and 155.51

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Solution

The fourth proportional to 386.81, 579.98 and 155.51 is: 233.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.81 : 579.98 = 155.51 : x
  2. Step 2: Convert to fraction form
    386.81/579.98 = 155.51/x
  3. Step 3: Cross multiply
    386.81x = 579.98 × 155.51
  4. Step 4: Simplify right side
    386.81x = 90,189.01
  5. Step 5: Solve for x
    x = 90,189.01/386.81
  6. Step 6: Final answer
    x = 233.16

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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.