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Finding the Fourth Proportional to 386, 579.10 and 129.50

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Solution

The fourth proportional to 386, 579.10 and 129.50 is: 194.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    386 : 579.10 = 129.50 : x
  2. Step 2: Convert to fraction form
    386/579.10 = 129.50/x
  3. Step 3: Cross multiply
    386x = 579.10 × 129.50
  4. Step 4: Simplify right side
    386x = 74,993.45
  5. Step 5: Solve for x
    x = 74,993.45/386
  6. Step 6: Final answer
    x = 194.28

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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.