Home / 1,918.20-2,645.70-1,420.86

Finding the Fourth Proportional to 1,918.20, 2,645.70 and 1,420.86

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Solution

The fourth proportional to 1,918.20, 2,645.70 and 1,420.86 is: 1,959.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.20 : 2,645.70 = 1,420.86 : x
  2. Step 2: Convert to fraction form
    1,918.20/2,645.70 = 1,420.86/x
  3. Step 3: Cross multiply
    1,918.20x = 2,645.70 × 1,420.86
  4. Step 4: Simplify right side
    1,918.20x = 3,759,169.30
  5. Step 5: Solve for x
    x = 3,759,169.30/1,918.20
  6. Step 6: Final answer
    x = 1,959.74

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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.