Home / 1,780.45-2,670.64-1,390.78

Finding the Fourth Proportional to 1,780.45, 2,670.64 and 1,390.78

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Solution

The fourth proportional to 1,780.45, 2,670.64 and 1,390.78 is: 2,086.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.45 : 2,670.64 = 1,390.78 : x
  2. Step 2: Convert to fraction form
    1,780.45/2,670.64 = 1,390.78/x
  3. Step 3: Cross multiply
    1,780.45x = 2,670.64 × 1,390.78
  4. Step 4: Simplify right side
    1,780.45x = 3,714,272.70
  5. Step 5: Solve for x
    x = 3,714,272.70/1,780.45
  6. Step 6: Final answer
    x = 2,086.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.