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Finding the Fourth Proportional to 485.28, 668.94 and 386.88

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Solution

The fourth proportional to 485.28, 668.94 and 386.88 is: 533.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.28 : 668.94 = 386.88 : x
  2. Step 2: Convert to fraction form
    485.28/668.94 = 386.88/x
  3. Step 3: Cross multiply
    485.28x = 668.94 × 386.88
  4. Step 4: Simplify right side
    485.28x = 258,799.51
  5. Step 5: Solve for x
    x = 258,799.51/485.28
  6. Step 6: Final answer
    x = 533.30

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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.