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Finding the Fourth Proportional to 1,920.23, 2,878.02 and 878.78

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Solution

The fourth proportional to 1,920.23, 2,878.02 and 878.78 is: 1,317.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.23 : 2,878.02 = 878.78 : x
  2. Step 2: Convert to fraction form
    1,920.23/2,878.02 = 878.78/x
  3. Step 3: Cross multiply
    1,920.23x = 2,878.02 × 878.78
  4. Step 4: Simplify right side
    1,920.23x = 2,529,132.03
  5. Step 5: Solve for x
    x = 2,529,132.03/1,920.23
  6. Step 6: Final answer
    x = 1,317.10

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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.