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Finding the Fourth Proportional to 918.13, 1,266.80 and 545.21

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Solution

The fourth proportional to 918.13, 1,266.80 and 545.21 is: 752.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.13 : 1,266.80 = 545.21 : x
  2. Step 2: Convert to fraction form
    918.13/1,266.80 = 545.21/x
  3. Step 3: Cross multiply
    918.13x = 1,266.80 × 545.21
  4. Step 4: Simplify right side
    918.13x = 690,672.03
  5. Step 5: Solve for x
    x = 690,672.03/918.13
  6. Step 6: Final answer
    x = 752.26

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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.