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Finding the Fourth Proportional to 1,185.58, 1,635.62 and 787.44

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Solution

The fourth proportional to 1,185.58, 1,635.62 and 787.44 is: 1,086.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.58 : 1,635.62 = 787.44 : x
  2. Step 2: Convert to fraction form
    1,185.58/1,635.62 = 787.44/x
  3. Step 3: Cross multiply
    1,185.58x = 1,635.62 × 787.44
  4. Step 4: Simplify right side
    1,185.58x = 1,287,952.61
  5. Step 5: Solve for x
    x = 1,287,952.61/1,185.58
  6. Step 6: Final answer
    x = 1,086.35

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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.