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Finding the Fourth Proportional to 485.94, 670.49 and 328.60

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Solution

The fourth proportional to 485.94, 670.49 and 328.60 is: 453.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.94 : 670.49 = 328.60 : x
  2. Step 2: Convert to fraction form
    485.94/670.49 = 328.60/x
  3. Step 3: Cross multiply
    485.94x = 670.49 × 328.60
  4. Step 4: Simplify right side
    485.94x = 220,319.66
  5. Step 5: Solve for x
    x = 220,319.66/485.94
  6. Step 6: Final answer
    x = 453.39

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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.