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Finding the Fourth Proportional to 1,712.76, 2,567.78 and 787.65

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Solution

The fourth proportional to 1,712.76, 2,567.78 and 787.65 is: 1,180.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,712.76 : 2,567.78 = 787.65 : x
  2. Step 2: Convert to fraction form
    1,712.76/2,567.78 = 787.65/x
  3. Step 3: Cross multiply
    1,712.76x = 2,567.78 × 787.65
  4. Step 4: Simplify right side
    1,712.76x = 2,022,511.92
  5. Step 5: Solve for x
    x = 2,022,511.92/1,712.76
  6. Step 6: Final answer
    x = 1,180.85

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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.