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Finding the Fourth Proportional to 1,957.89, 2,938.29 and 787.90

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Solution

The fourth proportional to 1,957.89, 2,938.29 and 787.90 is: 1,182.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,957.89 : 2,938.29 = 787.90 : x
  2. Step 2: Convert to fraction form
    1,957.89/2,938.29 = 787.90/x
  3. Step 3: Cross multiply
    1,957.89x = 2,938.29 × 787.90
  4. Step 4: Simplify right side
    1,957.89x = 2,315,083.02
  5. Step 5: Solve for x
    x = 2,315,083.02/1,957.89
  6. Step 6: Final answer
    x = 1,182.44

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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.