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Finding the Fourth Proportional to 1,445.79, 1,995.21 and 878.46

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Solution

The fourth proportional to 1,445.79, 1,995.21 and 878.46 is: 1,212.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.79 : 1,995.21 = 878.46 : x
  2. Step 2: Convert to fraction form
    1,445.79/1,995.21 = 878.46/x
  3. Step 3: Cross multiply
    1,445.79x = 1,995.21 × 878.46
  4. Step 4: Simplify right side
    1,445.79x = 1,752,712.18
  5. Step 5: Solve for x
    x = 1,752,712.18/1,445.79
  6. Step 6: Final answer
    x = 1,212.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.