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Finding the Fourth Proportional to 485.72, 670.20 and 411.92

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Solution

The fourth proportional to 485.72, 670.20 and 411.92 is: 568.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.72 : 670.20 = 411.92 : x
  2. Step 2: Convert to fraction form
    485.72/670.20 = 411.92/x
  3. Step 3: Cross multiply
    485.72x = 670.20 × 411.92
  4. Step 4: Simplify right side
    485.72x = 276,068.78
  5. Step 5: Solve for x
    x = 276,068.78/485.72
  6. Step 6: Final answer
    x = 568.37

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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.