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Finding the Fourth Proportional to 842.16, 1,256.88 and 787.44

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Solution

The fourth proportional to 842.16, 1,256.88 and 787.44 is: 1,175.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.16 : 1,256.88 = 787.44 : x
  2. Step 2: Convert to fraction form
    842.16/1,256.88 = 787.44/x
  3. Step 3: Cross multiply
    842.16x = 1,256.88 × 787.44
  4. Step 4: Simplify right side
    842.16x = 989,717.59
  5. Step 5: Solve for x
    x = 989,717.59/842.16
  6. Step 6: Final answer
    x = 1,175.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.