Home / 1,288.86-1,780.34-1,270.04

Finding the Fourth Proportional to 1,288.86, 1,780.34 and 1,270.04

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Solution

The fourth proportional to 1,288.86, 1,780.34 and 1,270.04 is: 1,754.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.86 : 1,780.34 = 1,270.04 : x
  2. Step 2: Convert to fraction form
    1,288.86/1,780.34 = 1,270.04/x
  3. Step 3: Cross multiply
    1,288.86x = 1,780.34 × 1,270.04
  4. Step 4: Simplify right side
    1,288.86x = 2,261,103.01
  5. Step 5: Solve for x
    x = 2,261,103.01/1,288.86
  6. Step 6: Final answer
    x = 1,754.34

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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.