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Finding the Fourth Proportional to 857.25, 1,284.93 and 787.86

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Solution

The fourth proportional to 857.25, 1,284.93 and 787.86 is: 1,180.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.25 : 1,284.93 = 787.86 : x
  2. Step 2: Convert to fraction form
    857.25/1,284.93 = 787.86/x
  3. Step 3: Cross multiply
    857.25x = 1,284.93 × 787.86
  4. Step 4: Simplify right side
    857.25x = 1,012,344.95
  5. Step 5: Solve for x
    x = 1,012,344.95/857.25
  6. Step 6: Final answer
    x = 1,180.92

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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.