Home / 1,257.16-1,743.24-1,215.70

Finding the Fourth Proportional to 1,257.16, 1,743.24 and 1,215.70

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Solution

The fourth proportional to 1,257.16, 1,743.24 and 1,215.70 is: 1,685.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.16 : 1,743.24 = 1,215.70 : x
  2. Step 2: Convert to fraction form
    1,257.16/1,743.24 = 1,215.70/x
  3. Step 3: Cross multiply
    1,257.16x = 1,743.24 × 1,215.70
  4. Step 4: Simplify right side
    1,257.16x = 2,119,256.87
  5. Step 5: Solve for x
    x = 2,119,256.87/1,257.16
  6. Step 6: Final answer
    x = 1,685.75

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.