Home / 1,905.24-2,629.80-1,315.20

Finding the Fourth Proportional to 1,905.24, 2,629.80 and 1,315.20

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Solution

The fourth proportional to 1,905.24, 2,629.80 and 1,315.20 is: 1,815.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,905.24 : 2,629.80 = 1,315.20 : x
  2. Step 2: Convert to fraction form
    1,905.24/2,629.80 = 1,315.20/x
  3. Step 3: Cross multiply
    1,905.24x = 2,629.80 × 1,315.20
  4. Step 4: Simplify right side
    1,905.24x = 3,458,712.96
  5. Step 5: Solve for x
    x = 3,458,712.96/1,905.24
  6. Step 6: Final answer
    x = 1,815.37

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1.5x scale

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.