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Finding the Fourth Proportional to 1,310.40, 1,809.19 and 813.56

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Solution

The fourth proportional to 1,310.40, 1,809.19 and 813.56 is: 1,123.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.40 : 1,809.19 = 813.56 : x
  2. Step 2: Convert to fraction form
    1,310.40/1,809.19 = 813.56/x
  3. Step 3: Cross multiply
    1,310.40x = 1,809.19 × 813.56
  4. Step 4: Simplify right side
    1,310.40x = 1,471,884.62
  5. Step 5: Solve for x
    x = 1,471,884.62/1,310.40
  6. Step 6: Final answer
    x = 1,123.23

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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.