Home / 1,780.35-2,455.60-1,189.86

Finding the Fourth Proportional to 1,780.35, 2,455.60 and 1,189.86

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Solution

The fourth proportional to 1,780.35, 2,455.60 and 1,189.86 is: 1,641.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.35 : 2,455.60 = 1,189.86 : x
  2. Step 2: Convert to fraction form
    1,780.35/2,455.60 = 1,189.86/x
  3. Step 3: Cross multiply
    1,780.35x = 2,455.60 × 1,189.86
  4. Step 4: Simplify right side
    1,780.35x = 2,921,820.22
  5. Step 5: Solve for x
    x = 2,921,820.22/1,780.35
  6. Step 6: Final answer
    x = 1,641.15

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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.