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Finding the Fourth Proportional to 1,217.72, 1,678.77 and 918.83

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Solution

The fourth proportional to 1,217.72, 1,678.77 and 918.83 is: 1,266.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.72 : 1,678.77 = 918.83 : x
  2. Step 2: Convert to fraction form
    1,217.72/1,678.77 = 918.83/x
  3. Step 3: Cross multiply
    1,217.72x = 1,678.77 × 918.83
  4. Step 4: Simplify right side
    1,217.72x = 1,542,495.85
  5. Step 5: Solve for x
    x = 1,542,495.85/1,217.72
  6. Step 6: Final answer
    x = 1,266.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.