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Finding the Fourth Proportional to 918.07, 1,266.15 and 792.21

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Solution

The fourth proportional to 918.07, 1,266.15 and 792.21 is: 1,092.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.07 : 1,266.15 = 792.21 : x
  2. Step 2: Convert to fraction form
    918.07/1,266.15 = 792.21/x
  3. Step 3: Cross multiply
    918.07x = 1,266.15 × 792.21
  4. Step 4: Simplify right side
    918.07x = 1,003,056.69
  5. Step 5: Solve for x
    x = 1,003,056.69/918.07
  6. Step 6: Final answer
    x = 1,092.57

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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.