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Finding the Fourth Proportional to 1,216.65, 1,823.76 and 485.85

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Solution

The fourth proportional to 1,216.65, 1,823.76 and 485.85 is: 728.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.65 : 1,823.76 = 485.85 : x
  2. Step 2: Convert to fraction form
    1,216.65/1,823.76 = 485.85/x
  3. Step 3: Cross multiply
    1,216.65x = 1,823.76 × 485.85
  4. Step 4: Simplify right side
    1,216.65x = 886,073.80
  5. Step 5: Solve for x
    x = 886,073.80/1,216.65
  6. Step 6: Final answer
    x = 728.29

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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.