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Finding the Fourth Proportional to 485.10, 670.41 and 397.62

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Solution

The fourth proportional to 485.10, 670.41 and 397.62 is: 549.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.10 : 670.41 = 397.62 : x
  2. Step 2: Convert to fraction form
    485.10/670.41 = 397.62/x
  3. Step 3: Cross multiply
    485.10x = 670.41 × 397.62
  4. Step 4: Simplify right side
    485.10x = 266,568.42
  5. Step 5: Solve for x
    x = 266,568.42/485.10
  6. Step 6: Final answer
    x = 549.51

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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.