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Finding the Fourth Proportional to 1,217.86, 1,678.89 and 867.94

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Solution

The fourth proportional to 1,217.86, 1,678.89 and 867.94 is: 1,196.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.86 : 1,678.89 = 867.94 : x
  2. Step 2: Convert to fraction form
    1,217.86/1,678.89 = 867.94/x
  3. Step 3: Cross multiply
    1,217.86x = 1,678.89 × 867.94
  4. Step 4: Simplify right side
    1,217.86x = 1,457,175.79
  5. Step 5: Solve for x
    x = 1,457,175.79/1,217.86
  6. Step 6: Final answer
    x = 1,196.51

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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.