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Finding the Fourth Proportional to 918.36, 1,267.44 and 638.52

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Solution

The fourth proportional to 918.36, 1,267.44 and 638.52 is: 881.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.36 : 1,267.44 = 638.52 : x
  2. Step 2: Convert to fraction form
    918.36/1,267.44 = 638.52/x
  3. Step 3: Cross multiply
    918.36x = 1,267.44 × 638.52
  4. Step 4: Simplify right side
    918.36x = 809,285.79
  5. Step 5: Solve for x
    x = 809,285.79/918.36
  6. Step 6: Final answer
    x = 881.23

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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.