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Finding the Fourth Proportional to 485.59, 669.49 and 396.98

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Solution

The fourth proportional to 485.59, 669.49 and 396.98 is: 547.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.59 : 669.49 = 396.98 : x
  2. Step 2: Convert to fraction form
    485.59/669.49 = 396.98/x
  3. Step 3: Cross multiply
    485.59x = 669.49 × 396.98
  4. Step 4: Simplify right side
    485.59x = 265,774.14
  5. Step 5: Solve for x
    x = 265,774.14/485.59
  6. Step 6: Final answer
    x = 547.32

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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.