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Finding the Fourth Proportional to 485.72, 670.56 and 320.08

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Solution

The fourth proportional to 485.72, 670.56 and 320.08 is: 441.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.72 : 670.56 = 320.08 : x
  2. Step 2: Convert to fraction form
    485.72/670.56 = 320.08/x
  3. Step 3: Cross multiply
    485.72x = 670.56 × 320.08
  4. Step 4: Simplify right side
    485.72x = 214,632.84
  5. Step 5: Solve for x
    x = 214,632.84/485.72
  6. Step 6: Final answer
    x = 441.89

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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.