Home / 1,805.40-2,708.10-1,315.80

Finding the Fourth Proportional to 1,805.40, 2,708.10 and 1,315.80

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Solution

The fourth proportional to 1,805.40, 2,708.10 and 1,315.80 is: 1,973.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,805.40 : 2,708.10 = 1,315.80 : x
  2. Step 2: Convert to fraction form
    1,805.40/2,708.10 = 1,315.80/x
  3. Step 3: Cross multiply
    1,805.40x = 2,708.10 × 1,315.80
  4. Step 4: Simplify right side
    1,805.40x = 3,563,317.98
  5. Step 5: Solve for x
    x = 3,563,317.98/1,805.40
  6. Step 6: Final answer
    x = 1,973.70

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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.