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Finding the Fourth Proportional to 386.83, 577.45 and 328.66

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Solution

The fourth proportional to 386.83, 577.45 and 328.66 is: 490.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.83 : 577.45 = 328.66 : x
  2. Step 2: Convert to fraction form
    386.83/577.45 = 328.66/x
  3. Step 3: Cross multiply
    386.83x = 577.45 × 328.66
  4. Step 4: Simplify right side
    386.83x = 189,784.61
  5. Step 5: Solve for x
    x = 189,784.61/386.83
  6. Step 6: Final answer
    x = 490.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.