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Finding the Fourth Proportional to 1,216.81, 1,825.14 and 485.86

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Solution

The fourth proportional to 1,216.81, 1,825.14 and 485.86 is: 728.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.81 : 1,825.14 = 485.86 : x
  2. Step 2: Convert to fraction form
    1,216.81/1,825.14 = 485.86/x
  3. Step 3: Cross multiply
    1,216.81x = 1,825.14 × 485.86
  4. Step 4: Simplify right side
    1,216.81x = 886,762.52
  5. Step 5: Solve for x
    x = 886,762.52/1,216.81
  6. Step 6: Final answer
    x = 728.76

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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.