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Finding the Fourth Proportional to 918.28, 1,267.12 and 545.20

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Solution

The fourth proportional to 918.28, 1,267.12 and 545.20 is: 752.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.28 : 1,267.12 = 545.20 : x
  2. Step 2: Convert to fraction form
    918.28/1,267.12 = 545.20/x
  3. Step 3: Cross multiply
    918.28x = 1,267.12 × 545.20
  4. Step 4: Simplify right side
    918.28x = 690,833.82
  5. Step 5: Solve for x
    x = 690,833.82/918.28
  6. Step 6: Final answer
    x = 752.31

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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.