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Finding the Fourth Proportional to 945.86, 1,418.99 and 878.36

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Solution

The fourth proportional to 945.86, 1,418.99 and 878.36 is: 1,317.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.86 : 1,418.99 = 878.36 : x
  2. Step 2: Convert to fraction form
    945.86/1,418.99 = 878.36/x
  3. Step 3: Cross multiply
    945.86x = 1,418.99 × 878.36
  4. Step 4: Simplify right side
    945.86x = 1,246,372.57
  5. Step 5: Solve for x
    x = 1,246,372.57/945.86
  6. Step 6: Final answer
    x = 1,317.72

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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.