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Finding the Fourth Proportional to 386.08, 531.60 and 359.20

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Solution

The fourth proportional to 386.08, 531.60 and 359.20 is: 494.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.08 : 531.60 = 359.20 : x
  2. Step 2: Convert to fraction form
    386.08/531.60 = 359.20/x
  3. Step 3: Cross multiply
    386.08x = 531.60 × 359.20
  4. Step 4: Simplify right side
    386.08x = 190,950.72
  5. Step 5: Solve for x
    x = 190,950.72/386.08
  6. Step 6: Final answer
    x = 494.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.