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Finding the Fourth Proportional to 1,310.55, 1,809.15 and 813.87

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Solution

The fourth proportional to 1,310.55, 1,809.15 and 813.87 is: 1,123.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.55 : 1,809.15 = 813.87 : x
  2. Step 2: Convert to fraction form
    1,310.55/1,809.15 = 813.87/x
  3. Step 3: Cross multiply
    1,310.55x = 1,809.15 × 813.87
  4. Step 4: Simplify right side
    1,310.55x = 1,472,412.91
  5. Step 5: Solve for x
    x = 1,472,412.91/1,310.55
  6. Step 6: Final answer
    x = 1,123.51

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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.