Home / 1,686.68-2,325.21-1,187.78

Finding the Fourth Proportional to 1,686.68, 2,325.21 and 1,187.78

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Solution

The fourth proportional to 1,686.68, 2,325.21 and 1,187.78 is: 1,637.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.68 : 2,325.21 = 1,187.78 : x
  2. Step 2: Convert to fraction form
    1,686.68/2,325.21 = 1,187.78/x
  3. Step 3: Cross multiply
    1,686.68x = 2,325.21 × 1,187.78
  4. Step 4: Simplify right side
    1,686.68x = 2,761,826.31
  5. Step 5: Solve for x
    x = 2,761,826.31/1,686.68
  6. Step 6: Final answer
    x = 1,637.43

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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.