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Finding the Fourth Proportional to 918.25, 1,267.83 and 829.54

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Solution

The fourth proportional to 918.25, 1,267.83 and 829.54 is: 1,145.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.25 : 1,267.83 = 829.54 : x
  2. Step 2: Convert to fraction form
    918.25/1,267.83 = 829.54/x
  3. Step 3: Cross multiply
    918.25x = 1,267.83 × 829.54
  4. Step 4: Simplify right side
    918.25x = 1,051,715.70
  5. Step 5: Solve for x
    x = 1,051,715.70/918.25
  6. Step 6: Final answer
    x = 1,145.35

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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.