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Finding the Fourth Proportional to 485.52, 669.36 and 345.84

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Solution

The fourth proportional to 485.52, 669.36 and 345.84 is: 476.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.52 : 669.36 = 345.84 : x
  2. Step 2: Convert to fraction form
    485.52/669.36 = 345.84/x
  3. Step 3: Cross multiply
    485.52x = 669.36 × 345.84
  4. Step 4: Simplify right side
    485.52x = 231,491.46
  5. Step 5: Solve for x
    x = 231,491.46/485.52
  6. Step 6: Final answer
    x = 476.79

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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.