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Finding the Fourth Proportional to 1,310.61, 1,808.49 and 813.06

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Solution

The fourth proportional to 1,310.61, 1,808.49 and 813.06 is: 1,121.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.61 : 1,808.49 = 813.06 : x
  2. Step 2: Convert to fraction form
    1,310.61/1,808.49 = 813.06/x
  3. Step 3: Cross multiply
    1,310.61x = 1,808.49 × 813.06
  4. Step 4: Simplify right side
    1,310.61x = 1,470,415.58
  5. Step 5: Solve for x
    x = 1,470,415.58/1,310.61
  6. Step 6: Final answer
    x = 1,121.94

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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.