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Finding the Fourth Proportional to 878.23, 1,317.55 and 261.96

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Solution

The fourth proportional to 878.23, 1,317.55 and 261.96 is: 393.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.23 : 1,317.55 = 261.96 : x
  2. Step 2: Convert to fraction form
    878.23/1,317.55 = 261.96/x
  3. Step 3: Cross multiply
    878.23x = 1,317.55 × 261.96
  4. Step 4: Simplify right side
    878.23x = 345,145.40
  5. Step 5: Solve for x
    x = 345,145.40/878.23
  6. Step 6: Final answer
    x = 393.00

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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.