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Finding the Fourth Proportional to 485.39, 670.05 and 328.12

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Solution

The fourth proportional to 485.39, 670.05 and 328.12 is: 452.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.39 : 670.05 = 328.12 : x
  2. Step 2: Convert to fraction form
    485.39/670.05 = 328.12/x
  3. Step 3: Cross multiply
    485.39x = 670.05 × 328.12
  4. Step 4: Simplify right side
    485.39x = 219,855.13
  5. Step 5: Solve for x
    x = 219,855.13/485.39
  6. Step 6: Final answer
    x = 452.94

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1.5x scale

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.