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Finding the Fourth Proportional to 1,216.16, 1,825.13 and 485.95

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Solution

The fourth proportional to 1,216.16, 1,825.13 and 485.95 is: 729.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.16 : 1,825.13 = 485.95 : x
  2. Step 2: Convert to fraction form
    1,216.16/1,825.13 = 485.95/x
  3. Step 3: Cross multiply
    1,216.16x = 1,825.13 × 485.95
  4. Step 4: Simplify right side
    1,216.16x = 886,921.92
  5. Step 5: Solve for x
    x = 886,921.92/1,216.16
  6. Step 6: Final answer
    x = 729.28

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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.