Home / 1,309.50-1,808.19-1,145.61

Finding the Fourth Proportional to 1,309.50, 1,808.19 and 1,145.61

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Solution

The fourth proportional to 1,309.50, 1,808.19 and 1,145.61 is: 1,581.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.50 : 1,808.19 = 1,145.61 : x
  2. Step 2: Convert to fraction form
    1,309.50/1,808.19 = 1,145.61/x
  3. Step 3: Cross multiply
    1,309.50x = 1,808.19 × 1,145.61
  4. Step 4: Simplify right side
    1,309.50x = 2,071,480.55
  5. Step 5: Solve for x
    x = 2,071,480.55/1,309.50
  6. Step 6: Final answer
    x = 1,581.89

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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.