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Finding the Fourth Proportional to 485.62, 728.57 and 211.74

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Solution

The fourth proportional to 485.62, 728.57 and 211.74 is: 317.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.62 : 728.57 = 211.74 : x
  2. Step 2: Convert to fraction form
    485.62/728.57 = 211.74/x
  3. Step 3: Cross multiply
    485.62x = 728.57 × 211.74
  4. Step 4: Simplify right side
    485.62x = 154,262.71
  5. Step 5: Solve for x
    x = 154,262.71/485.62
  6. Step 6: Final answer
    x = 317.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.