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Finding the Fourth Proportional to 918.13, 1,377.09 and 268.87

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Solution

The fourth proportional to 918.13, 1,377.09 and 268.87 is: 403.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.13 : 1,377.09 = 268.87 : x
  2. Step 2: Convert to fraction form
    918.13/1,377.09 = 268.87/x
  3. Step 3: Cross multiply
    918.13x = 1,377.09 × 268.87
  4. Step 4: Simplify right side
    918.13x = 370,254.75
  5. Step 5: Solve for x
    x = 370,254.75/918.13
  6. Step 6: Final answer
    x = 403.27

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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.