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Finding the Fourth Proportional to 918.74, 1,267.16 and 638.97

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Solution

The fourth proportional to 918.74, 1,267.16 and 638.97 is: 881.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.74 : 1,267.16 = 638.97 : x
  2. Step 2: Convert to fraction form
    918.74/1,267.16 = 638.97/x
  3. Step 3: Cross multiply
    918.74x = 1,267.16 × 638.97
  4. Step 4: Simplify right side
    918.74x = 809,674.03
  5. Step 5: Solve for x
    x = 809,674.03/918.74
  6. Step 6: Final answer
    x = 881.29

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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.