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Finding the Fourth Proportional to 918.96, 1,268.14 and 499.29

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Solution

The fourth proportional to 918.96, 1,268.14 and 499.29 is: 689.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.96 : 1,268.14 = 499.29 : x
  2. Step 2: Convert to fraction form
    918.96/1,268.14 = 499.29/x
  3. Step 3: Cross multiply
    918.96x = 1,268.14 × 499.29
  4. Step 4: Simplify right side
    918.96x = 633,169.62
  5. Step 5: Solve for x
    x = 633,169.62/918.96
  6. Step 6: Final answer
    x = 689.01

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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.