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Finding the Fourth Proportional to 1,310.66, 1,808.37 and 779.51

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Solution

The fourth proportional to 1,310.66, 1,808.37 and 779.51 is: 1,075.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.66 : 1,808.37 = 779.51 : x
  2. Step 2: Convert to fraction form
    1,310.66/1,808.37 = 779.51/x
  3. Step 3: Cross multiply
    1,310.66x = 1,808.37 × 779.51
  4. Step 4: Simplify right side
    1,310.66x = 1,409,633.46
  5. Step 5: Solve for x
    x = 1,409,633.46/1,310.66
  6. Step 6: Final answer
    x = 1,075.52

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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.