Home / 1,551.21-2,140.36-991.24

Finding the Fourth Proportional to 1,551.21, 2,140.36 and 991.24

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Solution

The fourth proportional to 1,551.21, 2,140.36 and 991.24 is: 1,367.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,551.21 : 2,140.36 = 991.24 : x
  2. Step 2: Convert to fraction form
    1,551.21/2,140.36 = 991.24/x
  3. Step 3: Cross multiply
    1,551.21x = 2,140.36 × 991.24
  4. Step 4: Simplify right side
    1,551.21x = 2,121,610.45
  5. Step 5: Solve for x
    x = 2,121,610.45/1,551.21
  6. Step 6: Final answer
    x = 1,367.72

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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.