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Finding the Fourth Proportional to 918.99, 1,268.42 and 624.38

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Solution

The fourth proportional to 918.99, 1,268.42 and 624.38 is: 861.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.99 : 1,268.42 = 624.38 : x
  2. Step 2: Convert to fraction form
    918.99/1,268.42 = 624.38/x
  3. Step 3: Cross multiply
    918.99x = 1,268.42 × 624.38
  4. Step 4: Simplify right side
    918.99x = 791,966.62
  5. Step 5: Solve for x
    x = 791,966.62/918.99
  6. Step 6: Final answer
    x = 861.78

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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.