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Finding the Fourth Proportional to 849.27, 1,172.04 and 639.07

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Solution

The fourth proportional to 849.27, 1,172.04 and 639.07 is: 881.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.27 : 1,172.04 = 639.07 : x
  2. Step 2: Convert to fraction form
    849.27/1,172.04 = 639.07/x
  3. Step 3: Cross multiply
    849.27x = 1,172.04 × 639.07
  4. Step 4: Simplify right side
    849.27x = 749,012.67
  5. Step 5: Solve for x
    x = 749,012.67/849.27
  6. Step 6: Final answer
    x = 881.95

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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.