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Finding the Fourth Proportional to 1,620.36, 2,429.46 and 787.20

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Solution

The fourth proportional to 1,620.36, 2,429.46 and 787.20 is: 1,180.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.36 : 2,429.46 = 787.20 : x
  2. Step 2: Convert to fraction form
    1,620.36/2,429.46 = 787.20/x
  3. Step 3: Cross multiply
    1,620.36x = 2,429.46 × 787.20
  4. Step 4: Simplify right side
    1,620.36x = 1,912,470.91
  5. Step 5: Solve for x
    x = 1,912,470.91/1,620.36
  6. Step 6: Final answer
    x = 1,180.28

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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.