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Finding the Fourth Proportional to 485.34, 669.92 and 310.92

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Solution

The fourth proportional to 485.34, 669.92 and 310.92 is: 429.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.34 : 669.92 = 310.92 : x
  2. Step 2: Convert to fraction form
    485.34/669.92 = 310.92/x
  3. Step 3: Cross multiply
    485.34x = 669.92 × 310.92
  4. Step 4: Simplify right side
    485.34x = 208,289.97
  5. Step 5: Solve for x
    x = 208,289.97/485.34
  6. Step 6: Final answer
    x = 429.16

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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.