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Finding the Fourth Proportional to 1,178.41, 1,768.81 and 485.49

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Solution

The fourth proportional to 1,178.41, 1,768.81 and 485.49 is: 728.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.41 : 1,768.81 = 485.49 : x
  2. Step 2: Convert to fraction form
    1,178.41/1,768.81 = 485.49/x
  3. Step 3: Cross multiply
    1,178.41x = 1,768.81 × 485.49
  4. Step 4: Simplify right side
    1,178.41x = 858,728.30
  5. Step 5: Solve for x
    x = 858,728.30/1,178.41
  6. Step 6: Final answer
    x = 728.72

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Double scale
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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.