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Finding the Fourth Proportional to 1,178.52, 1,768.17 and 485.51

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Solution

The fourth proportional to 1,178.52, 1,768.17 and 485.51 is: 728.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.52 : 1,768.17 = 485.51 : x
  2. Step 2: Convert to fraction form
    1,178.52/1,768.17 = 485.51/x
  3. Step 3: Cross multiply
    1,178.52x = 1,768.17 × 485.51
  4. Step 4: Simplify right side
    1,178.52x = 858,461.79
  5. Step 5: Solve for x
    x = 858,461.79/1,178.52
  6. Step 6: Final answer
    x = 728.42

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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.