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Finding the Fourth Proportional to 1,202.86, 1,659.94 and 678.89

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Solution

The fourth proportional to 1,202.86, 1,659.94 and 678.89 is: 936.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,202.86 : 1,659.94 = 678.89 : x
  2. Step 2: Convert to fraction form
    1,202.86/1,659.94 = 678.89/x
  3. Step 3: Cross multiply
    1,202.86x = 1,659.94 × 678.89
  4. Step 4: Simplify right side
    1,202.86x = 1,126,913.27
  5. Step 5: Solve for x
    x = 1,126,913.27/1,202.86
  6. Step 6: Final answer
    x = 936.87

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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.