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Finding the Fourth Proportional to 1,310.61, 1,809.03 and 779.87

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Solution

The fourth proportional to 1,310.61, 1,809.03 and 779.87 is: 1,076.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.61 : 1,809.03 = 779.87 : x
  2. Step 2: Convert to fraction form
    1,310.61/1,809.03 = 779.87/x
  3. Step 3: Cross multiply
    1,310.61x = 1,809.03 × 779.87
  4. Step 4: Simplify right side
    1,310.61x = 1,410,808.23
  5. Step 5: Solve for x
    x = 1,410,808.23/1,310.61
  6. Step 6: Final answer
    x = 1,076.45

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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.