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Finding the Fourth Proportional to 1,371.56, 2,058.40 and 787.14

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Solution

The fourth proportional to 1,371.56, 2,058.40 and 787.14 is: 1,181.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.56 : 2,058.40 = 787.14 : x
  2. Step 2: Convert to fraction form
    1,371.56/2,058.40 = 787.14/x
  3. Step 3: Cross multiply
    1,371.56x = 2,058.40 × 787.14
  4. Step 4: Simplify right side
    1,371.56x = 1,620,248.98
  5. Step 5: Solve for x
    x = 1,620,248.98/1,371.56
  6. Step 6: Final answer
    x = 1,181.32

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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.