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Finding the Fourth Proportional to 1,310.95, 1,809.03 and 787.27

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Solution

The fourth proportional to 1,310.95, 1,809.03 and 787.27 is: 1,086.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.95 : 1,809.03 = 787.27 : x
  2. Step 2: Convert to fraction form
    1,310.95/1,809.03 = 787.27/x
  3. Step 3: Cross multiply
    1,310.95x = 1,809.03 × 787.27
  4. Step 4: Simplify right side
    1,310.95x = 1,424,195.05
  5. Step 5: Solve for x
    x = 1,424,195.05/1,310.95
  6. Step 6: Final answer
    x = 1,086.38

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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.