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Finding the Fourth Proportional to 917.99, 1,376.79 and 268.78

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Solution

The fourth proportional to 917.99, 1,376.79 and 268.78 is: 403.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.99 : 1,376.79 = 268.78 : x
  2. Step 2: Convert to fraction form
    917.99/1,376.79 = 268.78/x
  3. Step 3: Cross multiply
    917.99x = 1,376.79 × 268.78
  4. Step 4: Simplify right side
    917.99x = 370,049.17
  5. Step 5: Solve for x
    x = 370,049.17/917.99
  6. Step 6: Final answer
    x = 403.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.