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Finding the Fourth Proportional to 1,318.25, 1,819.15 and 787.37

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Solution

The fourth proportional to 1,318.25, 1,819.15 and 787.37 is: 1,086.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.25 : 1,819.15 = 787.37 : x
  2. Step 2: Convert to fraction form
    1,318.25/1,819.15 = 787.37/x
  3. Step 3: Cross multiply
    1,318.25x = 1,819.15 × 787.37
  4. Step 4: Simplify right side
    1,318.25x = 1,432,333.07
  5. Step 5: Solve for x
    x = 1,432,333.07/1,318.25
  6. Step 6: Final answer
    x = 1,086.54

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1.5x scale

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.