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Finding the Fourth Proportional to 918.28, 1,266.96 and 545.41

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Solution

The fourth proportional to 918.28, 1,266.96 and 545.41 is: 752.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.28 : 1,266.96 = 545.41 : x
  2. Step 2: Convert to fraction form
    918.28/1,266.96 = 545.41/x
  3. Step 3: Cross multiply
    918.28x = 1,266.96 × 545.41
  4. Step 4: Simplify right side
    918.28x = 691,012.65
  5. Step 5: Solve for x
    x = 691,012.65/918.28
  6. Step 6: Final answer
    x = 752.51

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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.