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Finding the Fourth Proportional to 869.77, 1,304.11 and 485.29

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Solution

The fourth proportional to 869.77, 1,304.11 and 485.29 is: 727.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.77 : 1,304.11 = 485.29 : x
  2. Step 2: Convert to fraction form
    869.77/1,304.11 = 485.29/x
  3. Step 3: Cross multiply
    869.77x = 1,304.11 × 485.29
  4. Step 4: Simplify right side
    869.77x = 632,871.54
  5. Step 5: Solve for x
    x = 632,871.54/869.77
  6. Step 6: Final answer
    x = 727.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.