Home / 1,309.81-1,808.45-917.37

Finding the Fourth Proportional to 1,309.81, 1,808.45 and 917.37

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Solution

The fourth proportional to 1,309.81, 1,808.45 and 917.37 is: 1,266.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.81 : 1,808.45 = 917.37 : x
  2. Step 2: Convert to fraction form
    1,309.81/1,808.45 = 917.37/x
  3. Step 3: Cross multiply
    1,309.81x = 1,808.45 × 917.37
  4. Step 4: Simplify right side
    1,309.81x = 1,659,017.78
  5. Step 5: Solve for x
    x = 1,659,017.78/1,309.81
  6. Step 6: Final answer
    x = 1,266.61

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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.