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Finding the Fourth Proportional to 874.05, 1,206.68 and 671.79

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Solution

The fourth proportional to 874.05, 1,206.68 and 671.79 is: 927.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.05 : 1,206.68 = 671.79 : x
  2. Step 2: Convert to fraction form
    874.05/1,206.68 = 671.79/x
  3. Step 3: Cross multiply
    874.05x = 1,206.68 × 671.79
  4. Step 4: Simplify right side
    874.05x = 810,637.24
  5. Step 5: Solve for x
    x = 810,637.24/874.05
  6. Step 6: Final answer
    x = 927.45

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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.