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Finding the Fourth Proportional to 1,178.37, 1,767.42 and 485.11

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Solution

The fourth proportional to 1,178.37, 1,767.42 and 485.11 is: 727.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.37 : 1,767.42 = 485.11 : x
  2. Step 2: Convert to fraction form
    1,178.37/1,767.42 = 485.11/x
  3. Step 3: Cross multiply
    1,178.37x = 1,767.42 × 485.11
  4. Step 4: Simplify right side
    1,178.37x = 857,393.12
  5. Step 5: Solve for x
    x = 857,393.12/1,178.37
  6. Step 6: Final answer
    x = 727.61

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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.