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Finding the Fourth Proportional to 918.08, 1,369.12 and 866.96

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Solution

The fourth proportional to 918.08, 1,369.12 and 866.96 is: 1,292.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.08 : 1,369.12 = 866.96 : x
  2. Step 2: Convert to fraction form
    918.08/1,369.12 = 866.96/x
  3. Step 3: Cross multiply
    918.08x = 1,369.12 × 866.96
  4. Step 4: Simplify right side
    918.08x = 1,186,972.28
  5. Step 5: Solve for x
    x = 1,186,972.28/918.08
  6. Step 6: Final answer
    x = 1,292.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.