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Finding the Fourth Proportional to 1,787.12, 2,681.08 and 863.46

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Solution

The fourth proportional to 1,787.12, 2,681.08 and 863.46 is: 1,295.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,787.12 : 2,681.08 = 863.46 : x
  2. Step 2: Convert to fraction form
    1,787.12/2,681.08 = 863.46/x
  3. Step 3: Cross multiply
    1,787.12x = 2,681.08 × 863.46
  4. Step 4: Simplify right side
    1,787.12x = 2,315,005.34
  5. Step 5: Solve for x
    x = 2,315,005.34/1,787.12
  6. Step 6: Final answer
    x = 1,295.38

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1.5x scale

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.