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Finding the Fourth Proportional to 1,210.62, 1,816.24 and 878.70

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Solution

The fourth proportional to 1,210.62, 1,816.24 and 878.70 is: 1,318.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.62 : 1,816.24 = 878.70 : x
  2. Step 2: Convert to fraction form
    1,210.62/1,816.24 = 878.70/x
  3. Step 3: Cross multiply
    1,210.62x = 1,816.24 × 878.70
  4. Step 4: Simplify right side
    1,210.62x = 1,595,930.09
  5. Step 5: Solve for x
    x = 1,595,930.09/1,210.62
  6. Step 6: Final answer
    x = 1,318.28

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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.