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Finding the Fourth Proportional to 1,228.64, 1,695.88 and 787.72

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Solution

The fourth proportional to 1,228.64, 1,695.88 and 787.72 is: 1,087.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.64 : 1,695.88 = 787.72 : x
  2. Step 2: Convert to fraction form
    1,228.64/1,695.88 = 787.72/x
  3. Step 3: Cross multiply
    1,228.64x = 1,695.88 × 787.72
  4. Step 4: Simplify right side
    1,228.64x = 1,335,878.59
  5. Step 5: Solve for x
    x = 1,335,878.59/1,228.64
  6. Step 6: Final answer
    x = 1,087.28

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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.