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Finding the Fourth Proportional to 878.45, 1,315.85 and 713.21

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Solution

The fourth proportional to 878.45, 1,315.85 and 713.21 is: 1,068.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.45 : 1,315.85 = 713.21 : x
  2. Step 2: Convert to fraction form
    878.45/1,315.85 = 713.21/x
  3. Step 3: Cross multiply
    878.45x = 1,315.85 × 713.21
  4. Step 4: Simplify right side
    878.45x = 938,467.23
  5. Step 5: Solve for x
    x = 938,467.23/878.45
  6. Step 6: Final answer
    x = 1,068.33

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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.