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Finding the Fourth Proportional to 1,228.91, 1,695.89 and 787.28

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Solution

The fourth proportional to 1,228.91, 1,695.89 and 787.28 is: 1,086.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.91 : 1,695.89 = 787.28 : x
  2. Step 2: Convert to fraction form
    1,228.91/1,695.89 = 787.28/x
  3. Step 3: Cross multiply
    1,228.91x = 1,695.89 × 787.28
  4. Step 4: Simplify right side
    1,228.91x = 1,335,133.77
  5. Step 5: Solve for x
    x = 1,335,133.77/1,228.91
  6. Step 6: Final answer
    x = 1,086.44

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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.