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Finding the Fourth Proportional to 918.43, 1,267.02 and 545.43

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Solution

The fourth proportional to 918.43, 1,267.02 and 545.43 is: 752.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.43 : 1,267.02 = 545.43 : x
  2. Step 2: Convert to fraction form
    918.43/1,267.02 = 545.43/x
  3. Step 3: Cross multiply
    918.43x = 1,267.02 × 545.43
  4. Step 4: Simplify right side
    918.43x = 691,070.72
  5. Step 5: Solve for x
    x = 691,070.72/918.43
  6. Step 6: Final answer
    x = 752.45

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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.