Home / 1,640.39-2,260.31-1,115.51

Finding the Fourth Proportional to 1,640.39, 2,260.31 and 1,115.51

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Solution

The fourth proportional to 1,640.39, 2,260.31 and 1,115.51 is: 1,537.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.39 : 2,260.31 = 1,115.51 : x
  2. Step 2: Convert to fraction form
    1,640.39/2,260.31 = 1,115.51/x
  3. Step 3: Cross multiply
    1,640.39x = 2,260.31 × 1,115.51
  4. Step 4: Simplify right side
    1,640.39x = 2,521,381.53
  5. Step 5: Solve for x
    x = 2,521,381.53/1,640.39
  6. Step 6: Final answer
    x = 1,537.07

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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.