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Finding the Fourth Proportional to 485.82, 669.51 and 330.30

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Solution

The fourth proportional to 485.82, 669.51 and 330.30 is: 455.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.82 : 669.51 = 330.30 : x
  2. Step 2: Convert to fraction form
    485.82/669.51 = 330.30/x
  3. Step 3: Cross multiply
    485.82x = 669.51 × 330.30
  4. Step 4: Simplify right side
    485.82x = 221,139.15
  5. Step 5: Solve for x
    x = 221,139.15/485.82
  6. Step 6: Final answer
    x = 455.19

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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.