Home / 1,918.74-2,649.15-1,290.20

Finding the Fourth Proportional to 1,918.74, 2,649.15 and 1,290.20

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Solution

The fourth proportional to 1,918.74, 2,649.15 and 1,290.20 is: 1,781.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.74 : 2,649.15 = 1,290.20 : x
  2. Step 2: Convert to fraction form
    1,918.74/2,649.15 = 1,290.20/x
  3. Step 3: Cross multiply
    1,918.74x = 2,649.15 × 1,290.20
  4. Step 4: Simplify right side
    1,918.74x = 3,417,933.33
  5. Step 5: Solve for x
    x = 3,417,933.33/1,918.74
  6. Step 6: Final answer
    x = 1,781.34

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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.