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Finding the Fourth Proportional to 485.38, 670.12 and 299.12

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Solution

The fourth proportional to 485.38, 670.12 and 299.12 is: 412.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.38 : 670.12 = 299.12 : x
  2. Step 2: Convert to fraction form
    485.38/670.12 = 299.12/x
  3. Step 3: Cross multiply
    485.38x = 670.12 × 299.12
  4. Step 4: Simplify right side
    485.38x = 200,447.65
  5. Step 5: Solve for x
    x = 200,447.65/485.38
  6. Step 6: Final answer
    x = 412.97

Related Problems

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Half scale
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Double scale
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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.