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Finding the Fourth Proportional to 918.11, 1,266.97 and 525.11

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Solution

The fourth proportional to 918.11, 1,266.97 and 525.11 is: 724.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.11 : 1,266.97 = 525.11 : x
  2. Step 2: Convert to fraction form
    918.11/1,266.97 = 525.11/x
  3. Step 3: Cross multiply
    918.11x = 1,266.97 × 525.11
  4. Step 4: Simplify right side
    918.11x = 665,301.78
  5. Step 5: Solve for x
    x = 665,301.78/918.11
  6. Step 6: Final answer
    x = 724.64

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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.