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Finding the Fourth Proportional to 918.38, 1,268.32 and 786.62

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Solution

The fourth proportional to 918.38, 1,268.32 and 786.62 is: 1,086.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.38 : 1,268.32 = 786.62 : x
  2. Step 2: Convert to fraction form
    918.38/1,268.32 = 786.62/x
  3. Step 3: Cross multiply
    918.38x = 1,268.32 × 786.62
  4. Step 4: Simplify right side
    918.38x = 997,685.88
  5. Step 5: Solve for x
    x = 997,685.88/918.38
  6. Step 6: Final answer
    x = 1,086.35

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1.5x scale

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.