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Finding the Fourth Proportional to 1,309.77, 1,964.03 and 762.08

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Solution

The fourth proportional to 1,309.77, 1,964.03 and 762.08 is: 1,142.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.77 : 1,964.03 = 762.08 : x
  2. Step 2: Convert to fraction form
    1,309.77/1,964.03 = 762.08/x
  3. Step 3: Cross multiply
    1,309.77x = 1,964.03 × 762.08
  4. Step 4: Simplify right side
    1,309.77x = 1,496,734.35
  5. Step 5: Solve for x
    x = 1,496,734.35/1,309.77
  6. Step 6: Final answer
    x = 1,142.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.