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Finding the Fourth Proportional to 1,309.88, 1,965.46 and 790.08

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Solution

The fourth proportional to 1,309.88, 1,965.46 and 790.08 is: 1,185.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.88 : 1,965.46 = 790.08 : x
  2. Step 2: Convert to fraction form
    1,309.88/1,965.46 = 790.08/x
  3. Step 3: Cross multiply
    1,309.88x = 1,965.46 × 790.08
  4. Step 4: Simplify right side
    1,309.88x = 1,552,870.64
  5. Step 5: Solve for x
    x = 1,552,870.64/1,309.88
  6. Step 6: Final answer
    x = 1,185.51

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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.