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Finding the Fourth Proportional to 485.72, 670.34 and 320.06

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Solution

The fourth proportional to 485.72, 670.34 and 320.06 is: 441.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.72 : 670.34 = 320.06 : x
  2. Step 2: Convert to fraction form
    485.72/670.34 = 320.06/x
  3. Step 3: Cross multiply
    485.72x = 670.34 × 320.06
  4. Step 4: Simplify right side
    485.72x = 214,549.02
  5. Step 5: Solve for x
    x = 214,549.02/485.72
  6. Step 6: Final answer
    x = 441.71

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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.