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Finding the Fourth Proportional to 1,372.05, 2,056.46 and 787.05

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Solution

The fourth proportional to 1,372.05, 2,056.46 and 787.05 is: 1,179.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.05 : 2,056.46 = 787.05 : x
  2. Step 2: Convert to fraction form
    1,372.05/2,056.46 = 787.05/x
  3. Step 3: Cross multiply
    1,372.05x = 2,056.46 × 787.05
  4. Step 4: Simplify right side
    1,372.05x = 1,618,532.91
  5. Step 5: Solve for x
    x = 1,618,532.91/1,372.05
  6. Step 6: Final answer
    x = 1,179.65

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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.