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Finding the Fourth Proportional to 386.69, 580.06 and 112.80

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Solution

The fourth proportional to 386.69, 580.06 and 112.80 is: 169.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.69 : 580.06 = 112.80 : x
  2. Step 2: Convert to fraction form
    386.69/580.06 = 112.80/x
  3. Step 3: Cross multiply
    386.69x = 580.06 × 112.80
  4. Step 4: Simplify right side
    386.69x = 65,430.77
  5. Step 5: Solve for x
    x = 65,430.77/386.69
  6. Step 6: Final answer
    x = 169.21

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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.